Posted: 10/25/2012 8:11:54 AM EDT
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I have a DPMS rifle length MK12 18" barrel that I have been using on my 3 gun build, which is about 2 months old. Since day one I have had problems with unfired rounds getting stuck in the chamber when I attempt a manual eject using the charging handle. I have no problems with the rounds ejecting after they have been fired. I have tried these rounds in different ARs with no problems of them getting stuck. I've checked the rounds in a go/no go gauge and they are well within specifications. With all of this, I believe the problem is related to the barrel and something with the chamber being slightly out of spec. I contacted DPMS and they said I have to send in the upper so they can look at it but I don't want my rifle down for 3-4 weeks. I am looking at other barrels now and would really like to stick w/ a rifle length barrel but have noticed more mid length 18" barrels than rifle length.
Does anyone have comments or suggestions on going w/ a rifle length vs mid length? Bravo Company has a 18" rifle length stainless barrel for about $300 Spikes has a Lothar Walther 18" mid length for $355. Any feedback on these two barrels or other barrels I should look at? This range ($300-$350) is my price point as I already dumped $170 into a barrel (the DPMS) that I'm not happy with. Nick |
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My 2 cents.
I built a rifle with a WOA 18" match, mid-length gas system. Works fine but I wish I had used a rifle-length gas system. Anything that smooths out the recoil impulse is good. I don't see any disadvantage to a rifle gas system. The advantage I see besides any possible perceived recoil reduction would be increased forearm real estate. And if I did switch barrels I would check http://www.rainierarms.com |
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My 2 cents. I built a rifle with a WOA 18" match, mid-length gas system. Works fine but I wish I had used a rifle-length gas system. Anything that smooths out the recoil impulse is good. I don't see any disadvantage to a rifle gas system. The advantage I see besides any possible perceived recoil reduction would be increased forearm real estate. And if I did switch barrels I would check http://www.rainierarms.com I've looked at Rainier a bunch and have heard nothing but positive reviews, but its hard to catch anything in stock there. The only 18" barrels they have right now are midlength. They have a WOA 18" rifle length but it is a 1 in 7" twist. I'm trying to stay with a 1 in 8' if I can b/c I tend to shoot more 55grn than anything else. |
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I had a lother Walter 18" rifle length in a firebird precision upper. It was awesome! Id lean the LW direction simply because I haven't heard many 3 gunners talk about using the other. I've heard the Lother Walther blanks are some of the best. Do you have a lead on a distributor that sells these in 18" rifle length? Also would like to find one in a .223 Wylde chamber vs 556 if possible. Nick |
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I just built a dedicated 3-gun upper based on the Rainier 18" Match SPR utilizing the rifle length gas system and love it. The barrel in conjunction with the Syrac Ordnance Click-Adjustable Gas Block made a huge difference in recoil management. Still need to add a muzzle brake and plan on going to the JP low mass BGC but even with a standard bcg and flash suppressor it is night and day difference. Best bet at Rainier is to have money in hand and sign up for their "notify me" option. I waited about a week before it came back in stock and it immediately went to out of stock after my order so they must not carry too many at a time. +1 to them on quality, customer service, and low cost shipping.
Brian |
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I just built a dedicated 3-gun upper based on the Rainier 18" Match SPR utilizing the rifle length gas system and love it. The barrel in conjunction with the Syrac Ordnance Click-Adjustable Gas Block made a huge difference in recoil management. Still need to add a muzzle brake and plan on going to the JP low mass BGC but even with a standard bcg and flash suppressor it is night and day difference. Best bet at Rainier is to have money in hand and sign up for their "notify me" option. I waited about a week before it came back in stock and it immediately went to out of stock after my order so they must not carry too many at a time. +1 to them on quality, customer service, and low cost shipping. Brian I talked to Rainier this afternoon and they are expecting some barrels in about a week. I signed up to be notified when they come in and will grab one in a .223 Wlyde 18" rifle length. I just build my brother in laws 3 gun w/ a black rain upper and lower w/ that Bravocompany barrel and a Syrac adjustable gas block. The only problem I have seen w/ the gas block (and its not the gas blocks fault) is we are using the MI Gen 2 FF Handguards and the gas block touches the handguards inside. We are going to "mill" the block down at the bottom near the screws to see if we can create enough space to make it work. |
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Which Syrac gas block did you use? Clamp on or set screw. The set screw version is tiny. I'm using AP Custom Carbon Fiber FF tube and have no clearance issues with the set screw version. The Rainier barrel was already drilled for it too. A tip on installing it, heat the gas block up in the oven for a few minutes and it will slip right on. I preheated to 300 and then put the block between two metal pans to shield it from direct contact with the elements and left it in for 10 minutes. Went on like butter.
Brian |
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I had a lother Walter 18" rifle length in a firebird precision upper. It was awesome! Id lean the LW direction simply because I haven't heard many 3 gunners talk about using the other. I've heard the Lother Walther blanks are some of the best. Do you have a lead on a distributor that sells these in 18" rifle length? Also would like to find one in a .223 Wylde chamber vs 556 if possible. Nick The one I had was rifle length and .223 Wylde. You could call firebird precision and inquire about it. |
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I used an 18" Rainier Ultramatch with rifle gas system, Syrac set screw gas block, Troy VTAC 15" handguard, JP Lo-Mass BCG, and JP silent captured system.
VTAC handguard has a little room to spare, but no chance the clamp on version would work without a larger diameter handguard. The JP Lo-Mass BCG is a nice add-on, but other than noise, I think you couldachieve the same thing with JP's lo-Mass buffer or removing all the weights from a rifle buffer......and save a chunk of cash. |
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I used an 18" Rainier Ultramatch with rifle gas system, Syrac set screw gas block, Troy VTAC 15" handguard, JP Lo-Mass BCG, and JP silent captured system. VTAC handguard has a little room to spare, but no chance the clamp on version would work without a larger diameter handguard. The JP Lo-Mass BCG is a nice add-on, but other than noise, I think you couldachieve the same thing with JP's lo-Mass buffer or removing all the weights from a rifle buffer......and save a chunk of cash. I too had clearance issues with the clamp in Syrac gas blocks and my Samson Evolution handguard. I emailed Jason Adams at Syrac and he said they are cutting chips soon on a shorter version of the clamp on gas block. |
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I used an 18" Rainier Ultramatch with rifle gas system, Syrac set screw gas block, Troy VTAC 15" handguard, JP Lo-Mass BCG, and JP silent captured system. VTAC handguard has a little room to spare, but no chance the clamp on version would work without a larger diameter handguard. The JP Lo-Mass BCG is a nice add-on, but other than noise, I think you couldachieve the same thing with JP's lo-Mass buffer or removing all the weights from a rifle buffer......and save a chunk of cash. I too had clearance issues with the clamp in Syrac gas blocks and my Samson Evolution handguard. I emailed Jason Adams at Syrac and he said they are cutting chips soon on a shorter version of the clamp on gas block. We tried to shave off as much as we could but there is no way it will work with those handguards. Anyone have a suggestion on a good adjustable gas block that will work with these thinner handguards? Nick |
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I used an 18" Rainier Ultramatch with rifle gas system, Syrac set screw gas block, Troy VTAC 15" handguard, JP Lo-Mass BCG, and JP silent captured system. VTAC handguard has a little room to spare, but no chance the clamp on version would work without a larger diameter handguard. The JP Lo-Mass BCG is a nice add-on, but other than noise, I think you couldachieve the same thing with JP's lo-Mass buffer or removing all the weights from a rifle buffer......and save a chunk of cash. I too had clearance issues with the clamp in Syrac gas blocks and my Samson Evolution handguard. I emailed Jason Adams at Syrac and he said they are cutting chips soon on a shorter version of the clamp on gas block. We tried to shave off as much as we could but there is no way it will work with those handguards. Anyone have a suggestion on a good adjustable gas block that will work with these thinner handguards? Nick The Syrac with set-screws instead of the clamp......works perfect on mine. |
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I used an 18" Rainier Ultramatch with rifle gas system, Syrac set screw gas block, Troy VTAC 15" handguard, JP Lo-Mass BCG, and JP silent captured system. VTAC handguard has a little room to spare, but no chance the clamp on version would work without a larger diameter handguard. The JP Lo-Mass BCG is a nice add-on, but other than noise, I think you couldachieve the same thing with JP's lo-Mass buffer or removing all the weights from a rifle buffer......and save a chunk of cash. I too had clearance issues with the clamp in Syrac gas blocks and my Samson Evolution handguard. I emailed Jason Adams at Syrac and he said they are cutting chips soon on a shorter version of the clamp on gas block. We tried to shave off as much as we could but there is no way it will work with those handguards. Anyone have a suggestion on a good adjustable gas block that will work with these thinner handguards? Nick The Syrac with set-screws instead of the clamp......works perfect on mine. Didn't even know they had one with the set screws. Thanks! |
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I used an 18" Rainier Ultramatch with rifle gas system, Syrac set screw gas block, Troy VTAC 15" handguard, JP Lo-Mass BCG, and JP silent captured system. VTAC handguard has a little room to spare, but no chance the clamp on version would work without a larger diameter handguard. The JP Lo-Mass BCG is a nice add-on, but other than noise, I think you couldachieve the same thing with JP's lo-Mass buffer or removing all the weights from a rifle buffer......and save a chunk of cash. I too had clearance issues with the clamp in Syrac gas blocks and my Samson Evolution handguard. I emailed Jason Adams at Syrac and he said they are cutting chips soon on a shorter version of the clamp on gas block. We tried to shave off as much as we could but there is no way it will work with those handguards. Anyone have a suggestion on a good adjustable gas block that will work with these thinner handguards? Nick The Syrac with set-screws instead of the clamp......works perfect on mine. Didn't even know they had one with the set screws. Thanks! Its kinda the cat's meow! 
Hope the build goes well for you. The Syrac set screw model is located under the handguard on my new build. The 18" Rainier Ultramatch barrel has been very accurate for me so far.  Uploaded with ImageShack.us" />
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Rifle beats mid length. A friend of mine has a Bravo Company precision upper with a 20 inch stainless barrel and its a tack driver. I owned a AR10T with a Lothar Walther barrel and was not impressed but it was on AR10 platform that is generallly not as accurate as the AR15. I say get the Bravo Company.
Pat |
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In regards to your current DPMS barrel, are you sure the gas block is secure? It sounds like it's nit cycling. Its not the gas block, the cycle is fine. It's when I manually want to eject an unfired cartridge. After looking into it more, I don't believe the blame rests on the barrel, but is probably in the reloads. I have never had a problem w/ my reloads in the past but had to make an adjustment after getting a stuck .223 case in my sizing die. I've done everything I can think of to adjust it properly, but I am now looking at my crimp die as the possible reason. I thought I had it marked as the barrel when I tried my rounds in one of my other ARs and the rounds worked fine. But that barrel must has been shot more so the tolerances might now be as tight. I tried the ammo in another AR a couple of days ago and had the same issue I'm having w/ my DPMS barreled one. So again, I think it is my reloads and not the DPMS barrel. Once I figure it out, I'll post up what I found out. Nick |
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In regards to your current DPMS barrel, are you sure the gas block is secure? It sounds like it's nit cycling. Its not the gas block, the cycle is fine. It's when I manually want to eject an unfired cartridge. After looking into it more, I don't believe the blame rests on the barrel, but is probably in the reloads. I have never had a problem w/ my reloads in the past but had to make an adjustment after getting a stuck .223 case in my sizing die. I've done everything I can think of to adjust it properly, but I am now looking at my crimp die as the possible reason. I thought I had it marked as the barrel when I tried my rounds in one of my other ARs and the rounds worked fine. But that barrel must has been shot more so the tolerances might now be as tight. I tried the ammo in another AR a couple of days ago and had the same issue I'm having w/ my DPMS barreled one. So again, I think it is my reloads and not the DPMS barrel. Once I figure it out, I'll post up what I found out. Nick DPMS chambers can tend to be way on the tight side. I have had to send more than a few back to have their chambers reamed. Its not that expensive of a fix. Pat |