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HRT-556 or HRT-5K for 11.5" (Page 1 of 2)
Posted: 8/30/2026 12:49:58 PM EDT
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going to be assembling an 11.5" before years end and I think I have narrowed my suppressor choice down to either the HRT-556 or the K version. Just wondering how the K will compare to the fullsize on an 11.5"? I know the fullsize will be better but at 6.4" long and 16oz it's quite a bit to add to the end of the gun. Right now the only 5.56 cans I have are Hux Flows on 16" rifles, these do what I need but I want a little bit more out of this future build. ETA. I was planning on getting the Dual Lok mount version and using the two port Paladin brake for no reason other than I don't like the look of the EZ-Brake it comes with. Probably 99% of the shooting will be suppressed but will shoot unsuppressed when I feel like making lots of noise and fireballs. |
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There is more muzzle device flexibility in the HRT5, and on 11.5” and shorter guns having all the performance for flash and sound reduction is ideal, but that doesn’t mean you can’t run the short can and get acceptable results. A lot of people running ear protection only want sound down around 140DB and they can be happy with the shorter can. |
Austin, Managing Partner - www.GriffinArmament.com
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I have the hub K version and I love it. Not many rounds through it but it is quieter than my other longer larger diameter 3d cans. I’m probably going to try and get the full size before years end. 4.5” long and with how it performs on a 10.3” is crazy. Easily my best can purchase to date. |
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Originally Posted By Green0: There is more muzzle device flexibility in the HRT5, and on 11.5” and shorter guns having all the performance for flash and sound reduction is ideal, but that doesn’t mean you can’t run the short can and get acceptable results. A lot of people running ear protection only want sound down around 140DB and they can be happy with the shorter can. I run ears all the time but in an emergency it would be nice to be able to pop a couple rounds off without issues. Main thing is to take the edge off so it's enjoyable to shoot with just foam plugs in. How much length does each model actually add to the barrel when used with the Dual Lok Mount? |
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Originally Posted By xCLAYBUSTERx: I have the HUB HRT-556 AM on my 11.5" gun and I'll be ordering the K version for my 14.5" gun shortly. I'm using the Plan B system though which so far has been awesome. Hows the sound on the 11.5"? How much length did the full-size add to the barrel with the hub mount? |
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Originally Posted By xCLAYBUSTERx: About 5.375” I have the diligent defense ziltch screwed into the suppressor. It sounds great. OAL https://www.ar15.com/media/mediaFiles/14611/IMG_1355-3819727.jpg Thanks, puts the gun at about the length of a 16" with an A2 FH |
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Originally Posted By Xerith: I should hopefully have the K version by Friday. Just waiting on it to be shipped out to me via CA. It’s going on my MR 556 A4 factory SBR 11”. Keep us posted how it shoots. The form 1 I submitted Thursday came back approved this morning so it's going to be hard to hold off this build. Lol |
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After a lot of pondering im going with the 5 AM over the K for my 11.5" I really like the compactness and saved weight of the K but according to GA the full size AM is over 6 decibles lower than the K on a 12.5". 131 Vs. 137.3 on the K. I know chasing decibles on a 5.56 and all that, but 6 DB is huge. If I was putting it on a 14.5 or 16 then Id probably go with the K. I am already set up with Plan A so going the Hub route which will save some length and weight. Plus I already have a Turbo-K if I really need something short and light. |
Doesn't mean that much to me to mean that much to you.
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Originally Posted By swampvol: After a lot of pondering im going with the 5 AM over the K for my 11.5" I really like the compactness and saved weight of the K but according to GA the full size AM is over 6 decibles lower than the K on a 12.5". 131 Vs. 137.3 on the K. I know chasing decibles on a 5.56 and all that, but 6 DB is huge. If I was putting it on a 14.5 or 16 then Id probably go with the K. I am already set up with Plan A so going the Hub route which will save some length and weight. Plus I already have a Turbo-K if I really need something short and light. Solid choice! But the correct answer is… GET BOTH! 
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Originally Posted By swampvol: After a lot of pondering im going with the 5 AM over the K for my 11.5" I really like the compactness and saved weight of the K but according to GA the full size AM is over 6 decibles lower than the K on a 12.5". 131 Vs. 137.3 on the K. I know chasing decibles on a 5.56 and all that, but 6 DB is huge. If I was putting it on a 14.5 or 16 then Id probably go with the K. I am already set up with Plan A so going the Hub route which will save some length and weight. Plus I already have a Turbo-K if I really need something short and light. Good choice..I was tossing up between the full size and the K and went full size also.. Love it. I had Plan B...but got the Dual lock and glad I did..I like it much better. |
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Originally Posted By BlackbirdRider: Good choice..I was tossing up between the full size and the K and went full size also.. Love it. I had Plan B...but got the Dual lock and glad I did..I like it much better. Because why? What is better about it than plan b?https://www.ar15.com/forums/manageReply.html?a=squote&b=6&f=20&t=563650&tl=HRT-556-or-HRT-5K-for-11-5&r=6282770&page=1# |
“A government big enough to give you everything you want is a government big enough to take from you everything you have.” President Gerald Ford
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Originally Posted By 6731HBAR: Because why? What is better about it than plan b?https://www.ar15.com/forums/manageReply.html?a=squote&b=6&f=20&t=563650&tl=HRT-556-or-HRT-5K-for-11-5&r=6282770&page=1# Someone might want a locking mount. Plan B offered by Q has very few options, and through others it may or may not have the quality of Q. |
Austin, Managing Partner - www.GriffinArmament.com
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Originally Posted By Kgknight1037: I have the hrt 556 and 556k. I like both quite a bit. I mostly use griffins taper mount, plan A. I got another hrt 556k in dual lok and I have to say the dual lok is a great locking system. The griffins am cans are great and I have been very happy so far. Originally Posted By Kgknight1037: I have the hrt 556 and 556k. I like both quite a bit. I mostly use griffins taper mount, plan A. I got another hrt 556k in dual lok and I have to say the dual lok is a great locking system. The griffins am cans are great and I have been very happy so far. I'm glad that worked out. Originally Posted By thunderopossom: Just another post to say I love the K. I would trade my B&t cans for another in a heartbeat. A lot of people did trade B&T cans in on red cross for 50% off. |
Austin, Managing Partner - www.GriffinArmament.com
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Originally Posted By Brahmzy: The DL7AM is an absolutely amazing 30cal can FYI Thanks for the positive feedback. I think the DL7 AM is a really nice can, and we're hoping to differentiate the HRT7 by going for lower pressure, and might not be as quiet. We're right in the middle of it so hard to say what the outcome will be. Right now I have a really low flash can that is really low pressure, and not as quiet as I want it to be, so I'll have to see what we're able to accomplish. I like the super low flash and the super low recoil characteristics so it's all about can we keep that and get the ear noise down a little? The best of the initial prototypes were about 4DB louder than the DL7AM (both sides), and that was like 2DB more than I wanted the difference to be ideally. We have 6 prototypes in the machine tonight. Maybe with a little luck we'll accomplish something tomorrow. |
Austin, Managing Partner - www.GriffinArmament.com
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Originally Posted By Green0: Thanks for the positive feedback. I think the DL7 AM is a really nice can, and we're hoping to differentiate the HRT7 by going for lower pressure, and might not be as quiet. We're right in the middle of it so hard to say what the outcome will be. Right now I have a really low flash can that is really low pressure, and not as quiet as I want it to be, so I'll have to see what we're able to accomplish. I like the super low flash and the super low recoil characteristics so it's all about can we keep that and get the ear noise down a little? The best of the initial prototypes were about 4DB louder than the DL7AM (both sides), and that was like 2DB more than I wanted the difference to be ideally. We have 6 prototypes in the machine tonight. Maybe with a little luck we'll accomplish something tomorrow. I was blown away at how low back-pressure the DL7AM is, and such a soft shooter. I was paying razor-close attention to the ejection patterns and A/Bing between like 6 other 30cal cans, including other GA cans. Well, I JUST ORDERED the brand-new-today Optimus 6 AM and I’ll order the HRT7AM when it comes out too, lol. You guys are knocking it out of the park and making me broke - keep up the great work! 
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Received my HRT 5K today. It’s the hub version. Goal was to keep the package as short as possible on my factory SBR MR556 A4 and gas out of my face. Only shot a few rounds through to see how to it handled the gas. Tried 55 grain, 75 grain and 77 grain bullet weights. Using the suppressed setting and factory gas block vent screw. 55 grain, brass was 3 o’clock. The heavier bullets were 4 o’clock. Outside the fact I have like $150 worth of different sized gas screws that are basically useless now, I’m very happy with how it handled the gas. As a cross dominant shooter (have to use left eye and hand for rifles), no gas to the face. I have an over gassed 16” Daniel Defense I’ll try it out on this weekend when I have more time and can fully test it. If it manages to tame the DD, I will be very impressed. I don’t even like shooting the damn thing suppressed because it’s miserable. |
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Originally Posted By Green0: Someone might want a locking mount. Plan B offered by Q has very few options, and through others it may or may not have the quality of Q. Agreed and i switched to Plan B but there are varying specs and tapers to several different varieties of plan Bs systems. It kinda sucks in that regard. I used plan A forever and admittedly did switch to plan B with the FT556 for the wife's 11.5" pistol. |
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Originally Posted By thunderopossom: Just another post to say I love the K. I would trade my B&t cans for another in a heartbeat. You're making me regret my stupid old school surefire purchases. Granted specifications for what I wanted was really niche. 13.9" P/W 5" or less OAL can leaves very little options to choose from. Should've gotten a HRT 5k and Surefire HUB lol. |
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Generally we’ve been pretty relaxed on that stuff. I would imagine it qualifies. Maybe check your junk mail or drop them another email to reopen that ticket. They do not take form ones, and the 50% is off msrp I believe. |
Austin, Managing Partner - www.GriffinArmament.com
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Originally Posted By 5RWill: You're making me regret my stupid old school surefire purchases. Granted specifications for what I wanted was really niche. 13.9" P/W 5" or less OAL can leaves very little options to choose from. Should've gotten a HRT 5k and Surefire HUB lol. Griffin makes a long flash hider for 13.9 barrels in both Taper and Dual Lok FYI. |
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Originally Posted By bluedog82: Griffin makes a long flash hider for 13.9 barrels in both Taper and Dual Lok FYI. The 5k is pretty short, maybe the long flash hider would work with a dual lok hub, but the really long surefire hub would probably work. |
Austin, Managing Partner - www.GriffinArmament.com
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Originally Posted By bluedog82: Griffin makes a long flash hider for 13.9 barrels in both Taper and Dual Lok FYI. I know but it griffin's own description says they wont fit. Quote below. Trust me I have looked at this stuff ad nauseum, surefire is essentially the only can on the market that is 5" and has a deep enough distance to blast baffle to accommodate a 13.9" P/W build. I wanted to go HRT 5k so bad. I looked at gate lok, dual lok, hub with various adapters - which can and will work FWIW just with a caveat for me. There is a video of barrel and hatchet with a HRT 5K, surefire HUB, and 4 prong. Problem is the can becomes 6" with that HUB and you're adding a ton of weight plus $300. (WILL NOT ACCEPT: Closed Tine Flash Hider, FlashComp, 2.25″ Flash Hider, Tactical Comp, OTB Bayonet Flash Hider, or 2.75″ Flash Hider https://griffinarmament.com/product/dual-lok-hrt-5k-am-silencer/ The one maybe doable non-surefire combo i found was a IDG hesychia 556k with a revival defense HUB B and a blackout dynamics long flash hider, but when you realize that flash hider mounting interface to the barrel is essentially just one big spacer that is going to leave a large gap it negates the issue. Having said all this i wish i could go back, not order my FT556, and get a HRT 5K with the Zilch plan B for my 11.5" pistol. Haven't even shot the FT556 i just really like the HRT 5k |
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Originally Posted By 5RWill: I know but it griffin's own description says they wont fit. Quote below. Trust me I have looked at this stuff ad nauseum, surefire is essentially the only can on the market that is 5" and has a deep enough distance to blast baffle to accommodate a 13.9" P/W build. I wanted to go HRT 5k so bad. I looked at gate lok, dual lok, hub with various adapters - which can and will work FWIW just with a caveat for me. There is a video of barrel and hatchet with a HRT 5K, surefire HUB, and 4 prong. Problem is the can becomes 6" with that HUB and you're adding a ton of weight plus $300. (WILL NOT ACCEPT: Closed Tine Flash Hider, FlashComp, 2.25″ Flash Hider, Tactical Comp, OTB Bayonet Flash Hider, or 2.75″ Flash Hider https://griffinarmament.com/product/dual-lok-hrt-5k-am-silencer/ The one maybe doable non-surefire combo i found was a IDG hesychia 556k with a revival defense HUB B and a blackout dynamics long flash hider, but when you realize that flash hider mounting interface to the barrel is essentially just one big spacer that is going to leave a large gap it negates the issue. Having said all this i wish i could go back, not order my FT556, and get a HRT 5K with the Zilch plan B for my 11.5" pistol. Haven't even shot the FT556 i just really like the HRT 5k Have you looked at ECCO’s SS or Ti Extra Long HUB taper-mount adapters? https://www.eccomachine.net/product/griffin-1-375-24-bravo-ti-adapter/ |
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Originally Posted By Brahmzy: Have you looked at ECCO’s SS or Ti Extra Long HUB taper-mount adapters? https://www.eccomachine.net/product/griffin-1-375-24-bravo-ti-adapter/ That's the point though, sure it can be achieved with longer HUB adapters that increase the length of the can and coincidentally distance to blast baffle, but it defeats the entire purpose of seeking out a 4.5" can in the first place. Most of this can be remedied by SBRing the 13.9 or 13.5 or whatever you want. However this is my GPR and I want to be able to cross state lines without notifying the ATF. So 13.9" with a 5" can is about as short as I can conceivably go without SBRing. |
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Originally Posted By 5RWill: That's the point though, sure it can be achieved with longer HUB adapters that increase the length of the can and coincidentally distance to blast baffle, but it defeats the entire purpose of seeking out a 4.5" can in the first place. Most of this can be remedied by SBRing the 13.9 or 13.5 or whatever you want. However this is my GPR and I want to be able to cross state lines without notifying the ATF. So 13.9" with a 5" can is about as short as I can conceivably go without SBRing. Just SBR it. The ATF notification thing is going away soon anyway. |
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Originally Posted By Brahmzy: Just SBR it. The ATF notification thing is going away soon anyway. Attached File |
| Got to play around with the 5K on my 16” Daniel Defense. I got a little bit of gas to the face with it, but no where near what I was getting with like say a Ridgeback. Overall, I can actually shoot my Daniel Defense suppressed now and not have it be completely miserable. I’m very happy with this purchase to the point I may grab another one after Christmas. I would go ahead now, but I’m saving up to get into night vision. |
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Originally Posted By Brahmzy: Just SBR it. The ATF notification thing is going away soon anyway. I mean we'll see but I wouldn't hold my breath. I certainly hope so. MS still has to change their state law so it's a moot point for me. I have SBRs, if it does change I'll just remove the weld and leave it as is. |
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Is the description on the Griffin webpage for the 556 accurate that it gets a 12.5 down to 132 decibels? also considering a 556 versus a 556K for a.12.5 |
Isaiah 1:18 - "Come now, let us reason together," says the LORD: "though your sins are like scarlet, they shall be as white as snow"
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Originally Posted By Fooboy: Is the description on the Griffin webpage for the 556 accurate that it gets a 12.5 down to 132 decibels? also considering a 556 versus a 556K for a.12.5 I think the M4SDK AM needs to be in the question also, granted it's gate-lok but 4.89" vs 5.22" granted slightly heavier. I think Austin mentioned in another thread or on youtube M4SDK AM will give comparable performance to HRT 5K in sound, back pressure, and flash mitigation. My 12.5" truck gun is going to have a M4SDK AM. However Hub alleviates a couple ounces and keeping it around 4.5" If it were me i'd go K can My 11.5" with a resonator K is bearable if needed without ear pro. Not ideal but that's the trade off for OAL. However if hearing is really a consideration, then go fullsize and be done, talking 1.5" i doubt in reality it makes or breaks anything other than better sound suppression.  Griffin Armament: HRT 5K AM. Very Low Back Pressure. |
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Originally Posted By Fooboy: Is the description on the Griffin webpage for the 556 accurate that it gets a 12.5 down to 132 decibels? also considering a 556 versus a 556K for a.12.5 Yeah out of box included mount, I think we ran 131?DBA in 5rd avg testing muzzle. So 132 is achievable. The can is a pretty performing can. If sound is really important, the Optimus 6 puts down similar to better numbers with lower average sound due to the larger volume, so its another option and it lowers pressure and flash signature even further as well. I feel like 90% of people get everything they need in an HRT556 AM, and the other 10% could get whatever they still wanted in the Optimus 6. For a benchmark I would rate the RC2 as more like 40% of people got everything they need. In other words a can that has a tremendous following is putting gas in a shooters face, and is louder on both sides of the gun, and has more flash signature, is heating faster, is heavier, has a more problematic mounting system (albeit one of the better mounts), and is substantially more expensive and requires separate purchase of a more expensive muzzle device. I think benchmarking is a good way to get perspective when considering a suppressor purchase. You can’t define great without framing “good”. |
Austin, Managing Partner - www.GriffinArmament.com
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Originally Posted By Fooboy: Is the description on the Griffin webpage for the 556 accurate that it gets a 12.5 down to 132 decibels? also considering a 556 versus a 556K for a.12.5 That's the same rating as my Rhino S, and I am going to compare my HRT556 AM HUB to it when I get it. |
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Originally Posted By Green0: Yeah out of box included mount, I think we ran 131?DBA in 5rd avg testing muzzle. So 132 is achievable. The can is a pretty performing can. If sound is really important, the Optimus 6 puts down similar to better numbers with lower average sound due to the larger volume, so its another option and it lowers pressure and flash signature even further as well. I feel like 90% of people get everything they need in an HRT556 AM, and the other 10% could get whatever they still wanted in the Optimus 6. For a benchmark I would rate the RC2 as more like 40% of people got everything they need. In other words a can that has a tremendous following is putting gas in a shooters face, and is louder on both sides of the gun, and has more flash signature, is heating faster, is heavier, has a more problematic mounting system (albeit one of the better mounts), and is substantially more expensive and requires separate purchase of a more expensive muzzle device. I think benchmarking is a good way to get perspective when considering a suppressor purchase. You can’t define great without framing “good”. Slight thread drift, but @Green0 could you give more detail comparing the Optimus 6 Mod 2 AM to the HRT 5.56 AM? I'm a lefty looking for a can to use on AR's ranging from 10.5 to 16" and on a 20" bolt gun. I already have a PRC 22, so the main use will be AR's and primarily the 10.5. I was all set to choose the hub HRT 5.56 AM, but the length and weight penalty for the Optimus looks small. How much difference should I expect in terms of shooter's ear sound and backpressure? Thanks in advance. |
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Originally Posted By WI-2021: Slight thread drift, but @Green0 could you give more detail comparing the Optimus 6 Mod 2 AM to the HRT 5.56 AM? I'm a lefty looking for a can to use on AR's ranging from 10.5 to 16" and on a 20" bolt gun. I already have a PRC 22, so the main use will be AR's and primarily the 10.5. I was all set to choose the hub HRT 5.56 AM, but the length and weight penalty for the Optimus looks small. How much difference should I expect in terms of shooter's ear sound and backpressure? Thanks in advance. Peak sound is similar (about 1.2db lower Optimus 6 muzzle). Average sound is lower, and bolt speed is lower. Given your emphasis is left handed it makes sense to consider them both and ask if a marginal difference in sound and pressure is worth the size, weight, cost difference for you? You don’t lose anything except the difference in price. You gain performance. Shooting them different days, indoors, I couldn’t tell a difference in much more than flash reduction standing in front of the muzzle, but the same day back to back the bolt speed was noticeable. The sound difference is slightly noticeable indoor. I would say it sounds great and runs like a huxwrx flow556k can, while having flash reduction superior to an RC4 is a pretty good description of the Optimus 6 AM. Maybe outside they get more separated, but I’ve only shot them indoor. Every day is some kind of engineering or logistical issue to support engineering or manufacturing, so its been hard to take a trip and get outside for the last 13 months. |
Austin, Managing Partner - www.GriffinArmament.com
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Originally Posted By Green0: Peak sound is similar (about 1.2db lower Optimus 6 muzzle). Average sound is lower, and bolt speed is lower. Given your emphasis is left handed it makes sense to consider them both and ask if a marginal difference in sound and pressure is worth the size, weight, cost difference for you? You don’t lose anything except the difference in price. You gain performance. Shooting them different days, indoors, I couldn’t tell a difference in much more than flash reduction standing in front of the muzzle, but the same day back to back the bolt speed was noticeable. The sound difference is slightly noticeable indoor. I would say it sounds great and runs like a huxwrx flow556k can, while having flash reduction superior to an RC4 is a pretty good description of the Optimus 6 AM. Maybe outside they get more separated, but I’ve only shot them indoor. Every day is some kind of engineering or logistical issue to support engineering or manufacturing, so its been hard to take a trip and get outside for the last 13 months. Thanks again. I consider the size and weight difference to be pretty marginal, and I'll forget the cost difference pretty quickly too. It sounds like I should be leaning toward the Optimus 6. I'll throw a bit of a plot twist into the mix: I don't currently have an FRT, but I'm considering one, which would primarily be used in the 10.5. Does that affect the answer at all? The 10.5" upper in question is a RH with an Aero AGB. I don't know the port diameter. It's a little hard to tame the gas with the Sandman S I currently have. If all else fails, I may go nuts with lefty uppers, side charging, piston system, etc. Historically, I haven't been able to get results I like with suppressed AR's when it comes to gas blowback. Slow fire is fine with a halfway decent tune, but most of them gas me out with rapid fire. That said, I haven't tried any of the newer tech yet. |
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If the frt was a lot of the use case, there is an edge to HRT 556 AM with the better cooling and heavier thickness of parts in the smaller diameter unit. If cost is any object the FRT won’t be used enough to make that consideration weigh very heavily. I have a lot of machine guns but almost zero personal time, and they barely get fired. Things that get shot a significant amount are R&D guns, and testing guns. Machine guns can burn through $150 in less than 3 minutes even in an AR15 platform which isn’t designed for really hard full auto use. I would assume your lefty friendly characteristic is more important than hundreds of dollars in less than ten minutes. |
Austin, Managing Partner - www.GriffinArmament.com
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Originally Posted By WI-2021: Thanks again. I consider the size and weight difference to be pretty marginal, and I'll forget the cost difference pretty quickly too. It sounds like I should be leaning toward the Optimus 6. I'll throw a bit of a plot twist into the mix: I don't currently have an FRT, but I'm considering one, which would primarily be used in the 10.5. Does that affect the answer at all? The 10.5" upper in question is a RH with an Aero AGB. I don't know the port diameter. It's a little hard to tame the gas with the Sandman S I currently have. If all else fails, I may go nuts with lefty uppers, side charging, piston system, etc. Historically, I haven't been able to get results I like with suppressed AR's when it comes to gas blowback. Slow fire is fine with a halfway decent tune, but most of them gas me out with rapid fire. That said, I haven't tried any of the newer tech yet. I think either of them will reduce gas pretty well. I just got out again with my HRT5k and didn't notice any gas even with hotter ammo. I'm left handed and don't think you'll need to bother with lefty uppers and all that. I'm a big fan of the 5k, its right on the edge of the weight I like. Especially on shorter guns, I don't want 6" and 16oz hanging on the front. Also, it looks like there are some weight discrepancies on the website for the Optimus 6 AM, at least the dealer portal. Attached File Attached File |
www.newnanarmscompany.com
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I only trust suppressor weights when I weigh them on my 2 calibrated scales. Rifles too, parts too, optics too. I quickly learned not to trust Manu’s weight specs. Not hard to deduce the O6AM will be on the heftier side, given its diameter. I still think it will be lighter than my Velos LBP. My O6M-HUB is in jail right now. Hopefully not long. I’ll post weight specs when it’s in my hands. I’ve got to-the-gram weight specs on a crap ton of new and old cans in case anybody needs them. Ounces, Grams "Griffin Armament Dual Lok 5 AM HUB .224 (5.5"" Long)" 12.8 / 362 "Griffin Armament Dual Lok 5 AM HUB .224(5.7"" Long), ECCO Ti HUB Mount" 13.9 / 393 "Griffin Armament Dual Lok 7 AM HUB .300 (6.6"" Long)" 15.1 / 429 "Griffin Armament Dual Lok 7 AM HUB .300 (6.8"" Long), ECCO Ti HUB Mount" 16.3 / 462 "Griffin Armament EXPLORR Taper Mount Blast Shield - (3.5"" Long)" 4.8 / 135 "Griffin Armament EXPLORR Taper Mount .224 - (6.0"" Long)" 9.6 / 272 "Griffin Armament EXPLORR Taper Mount .300 - (6.5"" Long)" 10.5 / 298 "Griffin Armament HRT-556 AM HUB .224 (5.55"" Long)" 14.0 / 396 "Griffin Armament HRT-556 AM HUB .224 (5.75"" Long),ECCO Ti HUB Mount" 15.1 / 428 "Griffin Armament HRT-5K AM HUB .224 (4.51"" Long)" 11.6 / 328 "Griffin Armament HRT-5K AM HUB .224 (4.71"" Long),ECCO Ti HUB Mount" 12.7 / 359 "Griffin Armament RECCE 5K Taper Mount .224 - (5.8"" Long)" 14.0 / 397 Griffin Armament CHECKMATE-AM22 22LR (EZ-LOK® Base) 6.0 / 170 Griffin Armament CHECKMATE-HD 22LR w/Stock EZ-LOK® Rear Mount Adapter 5.9 / 166 Griffin Armament CHECKMATE-HD 22LR w/DT Rear Mount 6.3 / 179 |
HRT-556 or HRT-5K for 11.5" (Page 1 of 2)
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