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Posted: 5/1/2009 10:33:18 AM EDT
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Hi All,
This is my first post and I hope some of you guys can help me. I'm looking at two rifles right now, a Rock River Arms LAR-8 and a DPMS LR .308 AP4, both in .308 and 16" barrels. Both are new, the DPMS has a chrome bolt carrier and a quad rail. The RRA is bone stock and no sights. Both rifles are nice, I was hoping to find some information that can help me decide on which way to go seeing as I have not fired either of them. I'm leaning more towards the DPMS because I would like to one day get the 24" version, thus being able to use the same mags. Any input will be greatly appreciated. Thanks! Harry |
| I have them both and I think the Rock River is a little more accurate and I also like being able to use FAL magazines because they are very inexpensive and plentiful. Putting that aside they are both fine weapons and I honestly don't think you can go wrong with either one. |
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As a Rock River owner I will add that Rock River's fit and finish is excellent. Getting the take down pins out can be tough with just your fingers; I often have to use the tool they provide because the uppers fit so nice and tight to the lowers. I will add that the DPMS .308 rifles I've fondled are also very nice this way.
The Rock River 16" A4s are reportedly giving very impressive accuracy. See this AR-15 member's post for details: LINK This report is IMO very impressive. 1 MOA out to 500 yrds was enough to convince me. I now have both their 16" tacticle and 26" varmint 7.62 cal rifles, along with a couple of their AR-15's. I'm very pleased. NO reliability issues (NONE) after >1000 rounds through RRA rifles including mil surplus and match ammo from various suppliers. If you go with the LAR-8 in the 16" design you may be able to soon purchase a Varmint upper that you can swap. At least the 1994 AWB would still allow the Varmint upper to be purchased (no bayonet lug nor a flash hider) so this may be something to consider going forward. FINAL comment: note that the DPMS rifles do NOT all work with 7.62 NATO ammo; a couple do, but most are chambered in .308 WIN. The LR308 should not be operated with NATO ammo... this can be important when making your decision depending on what you plan to shoot. GOOD LUCK! |
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Thanks so much for the replies guys. I've read nothing but good things about both of these rifles. The DPMS comes with a chrome bolt carrier and a quadrail...not sure how much that is worth. The DMPS has front iron sights and removable rear, the RRA doesn't.
I'm confused about the chambering, please help clear this up for me, DPMS's web site states that the LR-308 AP4 fires the 7.62 NATO cartridge. craiger75, you said the LR-308 shouldn't be operated with this ammo...I'm a bit confused. I know there is a difference between .308 WIN and 7.62 NATO, now I'm just confused as to what fires what. The DPMS has 308 stamped on the lower and on the barrel it reads, "DPMS 7.62X51 1-10". How much is a chrome bolt carrier and a quad rail worth? Also, what benefits does a chrome bolt carrier provide? Thanks again guys, pardon my newbie questions. Harry |
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Harry, I may have been too broad with my statement about the LR308 platform––I thought none of them were chambered in 7.62 but if you found out otherwise you are correct.
The key issue is to be aware of this detail; 7.62 rated chambers can shoot both NATO 7.62 (higher pressure) and .308 WIN (lower pressure). Chambers rated for .308 are only rated for that pressure. This limitation is not a show-stopper, but rather something to be aware of as you think about the ammo you will want to shoot. PERSONALLY, I want to be able to shoot both without limitation. That means for me I need rifles chambered in 7.62. RRA fits that bill. So does Armalite. DPMS does with a few rifles. ALL OF THE ABOVE are great options for any shooter. The challenge for you is to pick a platform! Sorry, buddy, but this is your choice. For what its worth, I chose RRA because of FAL mags (I have a FAL also), brand name (as stated, I have had nothing but success and love their fit and finish), accuracy (as stated, plus the 26" Varmint model is poised to be AWESOME!!), and their reputation. I don't think you can go wrong, if that makes you feel better. Armalite and DPMS .308 platforms are great. Again, good luck! I hope you post your decision for us! EDIT: As you review all of the above, I also encourage you (if you havent already) to check out the FAL and HK91 designs. DSA FALs and PTR 91 rifles (respectively) are awesome black rifles who's based desings are battle-tested throughout the world and are now modern variants available at reasonable cost to us. I hate to add this twist, but truth-in-advertising leads me to this advice. I also enjoy both of these platforms and personally think the FAL design is impressive for several reasons. Again, you can't go wrong. I will warn you of this: you are risking getting a disease that me and other members have. If that happens your hard earned money will be at risk. |
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Harry, I may have been too broad with my statement about the LR308 platform––I thought none of them were chambered in 7.62 but if you found out otherwise you are correct. The key issue is to be aware of this detail; 7.62 rated chambers can shoot both NATO 7.62 (higher pressure) and .308 WIN (lower pressure). Chambers rated for .308 are only rated for that pressure. This limitation is not a show-stopper, but rather something to be aware of as you think about the ammo you will want to shoot. . I believe you have it backwards using 7.62 in a 308 chamber is fine. 308 in a military or surplus military gun is a nono. 308 ammo has the higher pressure over military 7.62. I know with 556 ammo is a no go in a 223. It is opposite in 308 & 7.62. .308 Win vs. 7.62x51––The Straight Scoop Before we go much further, we want to address the oft-posed question "Are the .308 Winchester and 7.62x51 NATO one and the same?" The simple answer is no. There are differences in chamber specs and maximum pressures. The SAMMI/CIP maximum pressure for the .308 Win cartridge is 62,000 psi, while the 7.62x51 max is 50,000 psi. Also, the headspace is slightly different. The .308 Win "Go Gauge" is 1.630" vs. 1.635" for the 7.62x51. The .308's "No-Go" dimension is 1.634" vs. 1.6405" for a 7.62x51 "No Go" gauge. That said, it is normally fine to shoot quality 7.62x51 NATO ammo in a gun chambered for the .308 Winchester (though not all NATO ammo is identical). Clint McKee of Fulton Armory notes: "[N]obody makes 7.62mm (NATO) ammo that isn't to the .308 'headspace' dimension spec. So 7.62mm ammo fits nicely into .308 chambers, as a rule." You CAN encounter problems going the other way, however. A commercial .308 Win round can exceed the max rated pressure for the 7.62x51. So, you should avoid putting full-power .308 Win rounds into military surplus rifles that have been designed for 50,000 psi max. For more information on this interesting topic, read the following articles: Gun Zone's 30 Caliber FAQ; Cruffler.com Technical Trivia, June 2001; and last, but not least, Steve Redgwell's .308 vs 7.62x51 Analysis, which really provides a definitive explanation. Reloaders should also note that military ammo often is made with a thicker web. Consequently the case capacity of 7.62x51 brass is usually less than that of commercial .308 brass. You may need to reduce recommended .308 Winchester loads by as much as 2 full grains, if you reload with military 7.62x51 brass, such as Lake City or IMI. M118 LR and the MilSurp Ammo Option One reason the .308 Win is so popular is the availability of very inexpensive 7.62x51 military surplus ammo. As explained in more detail above, a 7.62x51 chamber is NOT the same as a SAMMI-spec .308 Win chamber. Nonetheless it is normally safe to shoot 7.62x51 NATO-class ammo in your .308 Win because current .308 Winchester rifles are designed for higher maximum pressures |
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Harry, I may have been too broad with my statement about the LR308 platform––I thought none of them were chambered in 7.62 but if you found out otherwise you are correct. The key issue is to be aware of this detail; 7.62 rated chambers can shoot both NATO 7.62 (higher pressure) and .308 WIN (lower pressure). Chambers rated for .308 are only rated for that pressure. This limitation is not a show-stopper, but rather something to be aware of as you think about the ammo you will want to shoot. . I believe you have it backwards using 7.62 in a 308 chamber is fine. 308 in a military or surplus military gun is a nono. 308 ammo has the higher pressure over military 7.62. I know with 556 ammo is a no go in a 223. It is opposite in 308 & 7.62. .308 Win vs. 7.62x51––The Straight Scoop Before we go much further, we want to address the oft-posed question "Are the .308 Winchester and 7.62x51 NATO one and the same?" The simple answer is no. There are differences in chamber specs and maximum pressures. The SAMMI/CIP maximum pressure for the .308 Win cartridge is 62,000 psi, while the 7.62x51 max is 50,000 psi. Also, the headspace is slightly different. The .308 Win "Go Gauge" is 1.630" vs. 1.635" for the 7.62x51. The .308's "No-Go" dimension is 1.634" vs. 1.6405" for a 7.62x51 "No Go" gauge. That said, it is normally fine to shoot quality 7.62x51 NATO ammo in a gun chambered for the .308 Winchester (though not all NATO ammo is identical). Clint McKee of Fulton Armory notes: "[N]obody makes 7.62mm (NATO) ammo that isn't to the .308 'headspace' dimension spec. So 7.62mm ammo fits nicely into .308 chambers, as a rule." You CAN encounter problems going the other way, however. A commercial .308 Win round can exceed the max rated pressure for the 7.62x51. So, you should avoid putting full-power .308 Win rounds into military surplus rifles that have been designed for 50,000 psi max. For more information on this interesting topic, read the following articles: Gun Zone's 30 Caliber FAQ; Cruffler.com Technical Trivia, June 2001; and last, but not least, Steve Redgwell's .308 vs 7.62x51 Analysis, which really provides a definitive explanation. Reloaders should also note that military ammo often is made with a thicker web. Consequently the case capacity of 7.62x51 brass is usually less than that of commercial .308 brass. You may need to reduce recommended .308 Winchester loads by as much as 2 full grains, if you reload with military 7.62x51 brass, such as Lake City or IMI. M118 LR and the MilSurp Ammo Option One reason the .308 Win is so popular is the availability of very inexpensive 7.62x51 military surplus ammo. As explained in more detail above, a 7.62x51 chamber is NOT the same as a SAMMI-spec .308 Win chamber. Nonetheless it is normally safe to shoot 7.62x51 NATO-class ammo in your .308 Win because current .308 Winchester rifles are designed for higher maximum pressures Good piece, I learned something today. Thanks |
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Harry, I may have been too broad with my statement about the LR308 platform––I thought none of them were chambered in 7.62 but if you found out otherwise you are correct. The key issue is to be aware of this detail; 7.62 rated chambers can shoot both NATO 7.62 (higher pressure) and .308 WIN (lower pressure). Chambers rated for .308 are only rated for that pressure. This limitation is not a show-stopper, but rather something to be aware of as you think about the ammo you will want to shoot. . I believe you have it backwards using 7.62 in a 308 chamber is fine. 308 in a military or surplus military gun is a nono. 308 ammo has the higher pressure over military 7.62. I know with 556 ammo is a no go in a 223. It is opposite in 308 & 7.62. .308 Win vs. 7.62x51––The Straight Scoop Before we go much further, we want to address the oft-posed question "Are the .308 Winchester and 7.62x51 NATO one and the same?" The simple answer is no. There are differences in chamber specs and maximum pressures. The SAMMI/CIP maximum pressure for the .308 Win cartridge is 62,000 psi, while the 7.62x51 max is 50,000 psi. Also, the headspace is slightly different. The .308 Win "Go Gauge" is 1.630" vs. 1.635" for the 7.62x51. The .308's "No-Go" dimension is 1.634" vs. 1.6405" for a 7.62x51 "No Go" gauge. That said, it is normally fine to shoot quality 7.62x51 NATO ammo in a gun chambered for the .308 Winchester (though not all NATO ammo is identical). Clint McKee of Fulton Armory notes: "[N]obody makes 7.62mm (NATO) ammo that isn't to the .308 'headspace' dimension spec. So 7.62mm ammo fits nicely into .308 chambers, as a rule." You CAN encounter problems going the other way, however. A commercial .308 Win round can exceed the max rated pressure for the 7.62x51. So, you should avoid putting full-power .308 Win rounds into military surplus rifles that have been designed for 50,000 psi max. For more information on this interesting topic, read the following articles: Gun Zone's 30 Caliber FAQ; Cruffler.com Technical Trivia, June 2001; and last, but not least, Steve Redgwell's .308 vs 7.62x51 Analysis, which really provides a definitive explanation. Reloaders should also note that military ammo often is made with a thicker web. Consequently the case capacity of 7.62x51 brass is usually less than that of commercial .308 brass. You may need to reduce recommended .308 Winchester loads by as much as 2 full grains, if you reload with military 7.62x51 brass, such as Lake City or IMI. M118 LR and the MilSurp Ammo Option One reason the .308 Win is so popular is the availability of very inexpensive 7.62x51 military surplus ammo. As explained in more detail above, a 7.62x51 chamber is NOT the same as a SAMMI-spec .308 Win chamber. Nonetheless it is normally safe to shoot 7.62x51 NATO-class ammo in your .308 Win because current .308 Winchester rifles are designed for higher maximum pressures Commercial .308 has a higher SAMMI limit, but modern rifles like the DPMS (that are chambered in 7.62) are built to handle the higher pressure of .308, and will work just fine with it. But if you buy one in .308, it might malfunction with 7.62 (some people on this board have reported troubles with that). The pressure limits apply to older surplus rifles like FAL and M14, not to new DPMS rifles. Also, most DPMS are chambered in 7.62, not .308. I have the LR308TAC20, which is chambered in 7.62, and it feeds 100% with both 7.62NATO and with commercial .308 (but of course the 168gr .308 are much more accurate than the 7.62NATO). And no, it is not dangerous to do it....just ask the manufacturer if you don't believe me. Their warranty is void if you shoot reloads, but not if you shoot .308 out of their 7.62. When I bought mine, I could still get DPMS mags for 26 bucks, so it wasn't an issue. Now they are tough to get and more expensive. But Magpul has a new mag for it on the way, and the buying craze is showing signs of letting up, so the mag issue shouldn't deter a person from buying one. |
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Harry, I may have been too broad with my statement about the LR308 platform––I thought none of them were chambered in 7.62 but if you found out otherwise you are correct. The key issue is to be aware of this detail; 7.62 rated chambers can shoot both NATO 7.62 (higher pressure) and .308 WIN (lower pressure). Chambers rated for .308 are only rated for that pressure. This limitation is not a show-stopper, but rather something to be aware of as you think about the ammo you will want to shoot. . I believe you have it backwards using 7.62 in a 308 chamber is fine. 308 in a military or surplus military gun is a nono. 308 ammo has the higher pressure over military 7.62. I know with 556 ammo is a no go in a 223. It is opposite in 308 & 7.62. .308 Win vs. 7.62x51––The Straight Scoop Before we go much further, we want to address the oft-posed question "Are the .308 Winchester and 7.62x51 NATO one and the same?" The simple answer is no. There are differences in chamber specs and maximum pressures. The SAMMI/CIP maximum pressure for the .308 Win cartridge is 62,000 psi, while the 7.62x51 max is 50,000 psi. Also, the headspace is slightly different. The .308 Win "Go Gauge" is 1.630" vs. 1.635" for the 7.62x51. The .308's "No-Go" dimension is 1.634" vs. 1.6405" for a 7.62x51 "No Go" gauge. That said, it is normally fine to shoot quality 7.62x51 NATO ammo in a gun chambered for the .308 Winchester (though not all NATO ammo is identical). Clint McKee of Fulton Armory notes: "[N]obody makes 7.62mm (NATO) ammo that isn't to the .308 'headspace' dimension spec. So 7.62mm ammo fits nicely into .308 chambers, as a rule." You CAN encounter problems going the other way, however. A commercial .308 Win round can exceed the max rated pressure for the 7.62x51. So, you should avoid putting full-power .308 Win rounds into military surplus rifles that have been designed for 50,000 psi max. For more information on this interesting topic, read the following articles: Gun Zone's 30 Caliber FAQ; Cruffler.com Technical Trivia, June 2001; and last, but not least, Steve Redgwell's .308 vs 7.62x51 Analysis, which really provides a definitive explanation. Reloaders should also note that military ammo often is made with a thicker web. Consequently the case capacity of 7.62x51 brass is usually less than that of commercial .308 brass. You may need to reduce recommended .308 Winchester loads by as much as 2 full grains, if you reload with military 7.62x51 brass, such as Lake City or IMI. M118 LR and the MilSurp Ammo Option One reason the .308 Win is so popular is the availability of very inexpensive 7.62x51 military surplus ammo. As explained in more detail above, a 7.62x51 chamber is NOT the same as a SAMMI-spec .308 Win chamber. Nonetheless it is normally safe to shoot 7.62x51 NATO-class ammo in your .308 Win because current .308 Winchester rifles are designed for higher maximum pressures Commercial .308 has a higher SAMMI limit, but modern rifles like the DPMS (that are chambered in 7.62) are built to handle the higher pressure of .308, and will work just fine with it. But if you buy one in .308, it might malfunction with 7.62 (some people on this board have reported troubles with that). The pressure limits apply to older surplus rifles like FAL and M14, not to new DPMS rifles. Also, most DPMS are chambered in 7.62, not .308. I have the LR308TAC20, which is chambered in 7.62, and it feeds 100% with both 7.62NATO and with commercial .308 (but of course the 168gr .308 are much more accurate than the 7.62NATO). And no, it is not dangerous to do it....just ask the manufacturer if you don't believe me. Their warranty is void if you shoot reloads, but not if you shoot .308 out of their 7.62. When I bought mine, I could still get DPMS mags for 26 bucks, so it wasn't an issue. Now they are tough to get and more expensive. But Magpul has a new mag for it on the way, and the buying craze is showing signs of letting up, so the mag issue shouldn't deter a person from buying one. Concerning DPMS LR308's and ammo... here is a response directly from the DPMS forums by JonF... a moderator in their FAQ section and an employee of DPMS: http://www.dpmsinc.com/forum/posts.aspx?postID=4062 "DPMS | Panther Arms Home | New Posts | Active Posts | Member –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– + Home » + Customer Support » + DPMS Made Products » + Ammo question Previous Topic Next Topic advanced Posted: 3/2/2009 12:02 PM #4062 RJ guy Member Total Posts:2 Last Post:3/4/2009 Member Since:2/25/2009 Subject: Ammo question In FAQ, there is a post regarding .308/7.62x51. The barrel on my LR308 is stamped 7.62x51, but the receiver is stamped: CAL. 308 I know 7.62 NATO is different, But now i'm not sure regarding the correct ammo to use. .308, or 7.62x51, one in the same I thought. Posted: 3/2/2009 4:10 PM #4072 JonF Moderator Total Posts:494 Last Post:5/1/2009 Member Since:2/26/2008 Only the barrel stamp should be used to identify the caliber of your rifle. Being that it is a 7.62x51, you may safely fire either 7.62x51 or .308 rounds. JonF" FS |
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I believe you have it backwards using 7.62 in a 308 chamber is fine. 308 in a military or surplus military gun is a nono. 308 ammo has the higher pressure over military 7.62. I know with 556 ammo is a no go in a 223. It is opposite in 308 & 7.62. Yes, you are right, I was backwards. I knew better, but was thinking 5.56 vs .223 and completely convinced myself of the order of operations! My bad... Thanks for the correction. Similarily, the linked info from the DPMS mod. is also very interesting––I learned something there as well. SO: HARRY, go for any chamber from DPMS––it sounds like you will be just fine! |
| THANKS Guys for clearing up the 308 & 7.62 issue with the new rifles. kinda wondered myself about the ammo in them. Getting ready to add a 7.62 rifle to my arsenal & was gonna ask that question about the. I figured it was good to go in the rifles. The only reason I brought that up about switching was in case someone had an older rifle. I had checked into it one time when I lucked into a Great buy on some 7.62 & was wondering if I could shoot it in my bolt 308's. Now to decide on a DPMS, RR or Armalite. Even considering a FNAR. |
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Thanks for the wealth of information gents, very much appreciated. Two questions.
1. What does a chrome bolt carrier do and how much would it cost to have done? 2. How much would it cost to have a quad rail attached? Like I said, the DPMS has the above mods and the RRA is bone stock, no sights. So I'm trying to do the math. Once again, thanks so much for all the detailed info!! Harry 
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Thanks for the wealth of information gents, very much appreciated. Two questions. 1. What does a chrome bolt carrier do and how much would it cost to have done? 2. How much would it cost to have a quad rail attached? Like I said, the DPMS has the above mods and the RRA is bone stock, no sights. So I'm trying to do the math. Once again, thanks so much for all the detailed info!! Harry 1 - exterior chrome just makes it a little easier to clean. YMMV Most if not all are chromed in the cylinder. 2 - that will depend on the rail and if you buy the tools and do it yourself or if you send it out. You'll just have to check around. Most have praised the SWS products and service. |
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Thanks for the wealth of information gents, very much appreciated. Two questions. 1. What does a chrome bolt carrier do and how much would it cost to have done? 2. How much would it cost to have a quad rail attached? Like I said, the DPMS has the above mods and the RRA is bone stock, no sights. So I'm trying to do the math. Once again, thanks so much for all the detailed info!! Harry Regarding quad rails, consider the Daniel Defense rails. They make them for both DPMS and RRA (and Armalite). Not cheap, but very good quality––I highly recommend (from experience). If you go with the 12.0 rail for the RRA 16" mid length, you will need a low-profile gas block. There are several options, but add $50 for your budget there. If you go to a local gun smith/dealer, I'm guessing you may pay $25 for install if you don't order through them. Other options are also out there (my earlier range report link for RRA noted the build details, I think). My only advice: GO FOR FREE FLOAT when you make your decision––will help with accuracy. |
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Thanks guys! Well, I went with the RRA...I was going to go with the DPMS because it had the quad rail, but it was sold. When I saw the RRA in person, I could tell right off the bat that it was a quality piece of equipment. I found it rather heavy at first. I put about 50yrds through it so far and all I can say is WOW! I picked up a RRA scope rail as well. Need to get a couple magazines, it only came with one (and it was grey...not black).
Still, I want a DPMS. I have my eye out of for a 308 SASS. The prices that I've seen for them these days are upwards of $2500...www.rguns.net has them for a lot less but there is a 12 week wait (at least). I never purchased anything from them, anyone have anything to say about them?? Once again, I'm VERY impressed with the build quality and feel of the RRA. Finish is beautiful, a gem. Harry |
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Interesting note from the DPMS forum FAQ:
Subject: Can I use 7.62x51mm ammo in my .308? While you can physically fire either 308 or 7.62 NATO from a 308, you will see reduced accuracy from increased wear in the throat of the rifling and a higher chance of erratic cycling, including a higher chance of failures to extract. It is for this reason we recommend using only commercial 308 in a 308 barrel. DPMS does not recommend or warranty the use of 7.62x51 ammo in a .308 chamber. A 7.62x51 chamber can handle both types of ammo. Determine your actual chambering by looking on the underside of your barrel forward of the gas block or front sight base. The lower receivers of these two rifles are identical and will be stamped 308 even on a 7.62, the lower stamp should not be used to determine actual chambering. FWIW, the .260, .243, .300 SAUM, .308, 7.62x51 and 6.5 Creedmoor all use the same lower receiver. [Edited on 4/17/2009] Here's the link: http://dpmsinc.com/forum/posts.aspx?postID=2271 |
| I can't speak for the RRA, because I've held but never fired one. I've had several DPMS rifles, including a 24" heavy, an LR308T and an AP4. I still have the last two, and they're tack drivers. Even the AP4 shoots sub-MOA with good ammo, and the 308T shoots five round, 3" groups at 300 yards. It probably shoots better than that, but I've got old eyes. The 24" would shoot the same hole at 100 yards all day long, from the first cold shot to the last round with a hot barrel. I never got to shoot it beyond 100 yards, though. Each DPMS has had top function, fit and finish. Magazines are more expensive then FAL mags, but the DPMS mags are top quality, and I'll be trying out some CProducts mags a little later today. Either RRA or DPMS are fine rifles. |
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Regarding quad rails, consider the Daniel Defense rails. They make them for both DPMS and RRA (and Armalite). Not cheap, but very good quality––I highly recommend (from experience). If you go with the 12.0 rail for the RRA 16" mid length, you will need a low-profile gas block. There are several options, but add $50 for your budget there. If you go to a local gun smith/dealer, I'm guessing you may pay $25 for install if you don't order through them. Other options are also out there (my earlier range report link for RRA noted the build details, I think). My only advice: GO FOR FREE FLOAT when you make your decision––will help with accuracy. Thanks! I'd very much like to add the quad rails for the RRA, the $400 ball park is a rather large chunk of change for me though. Aside from having numerous places to mount stuff on, how does a free floating barrel help with accuracy? Also, will the rifle be lighter? (Trying to justify spending close to $500 to have this done...rail, gas block, labor, etc. And if anyone can point me in the right direction to those who sell factory RRA uppers, I'd really appreciate it. Thanks! Harry |
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Thanks, what about the free floating barrel? Absoulutly. I had a bipod mounted on the hand guards and while looking thought the scope, you could see movement in the picture as i tighen up on the rifle. Free float it and the problem goes away. Harry, the advantage of free-float is that the rail won't touch the barrel directly. Upon examination of a free-float barrel, you will note that the stock (or handguard/quad rail) isn't touching the barrel. This means that it won't put pressure on the barrel and therefore won't affect accuracy. Consider that even stainless steel (or other alloys) can be deflected several microns with pressure, depending on several factors (location of the force, amount of force, ambient temperature), This adds up down-range. This means that a bipod can cause problems if the mounted bipod can transfer force to the barrel when sitting on a bench. A free-float handguard or rail offers the advantage that the guard itself won't put force on the barrel, nor will anything you attach to that rail. Also see this link for more info. Good luck! |
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