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Thread: Recoil spring recommendation for 20" guns

  1. #1
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    Recoil spring recommendation for 20" guns

    Just finished building a 20" A2 gun, it's all Colt with an off brand lightweight 20" barrel. The only recoil spring that I have is a Wolff XP rifle length spring.
    Now, I haven't shot it yet, but what's the thinking behind these heavier recoil springs, instead of standard springs, with rifle length gas systems? Any problems that I should look out for?
    Just want to know if I should plan on needing a standard spring, or if this Wolff will be good.
    I will be shooting it Tuesday.
    Thanks guys

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    Im in for an answer to this myself..please let us know how it goes Tuesday.
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    I run a Sprinco spring in my 20" rifle. It works just fine. The rifle is a lot more forgiving than the other gas systems.



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    Quote Originally Posted by Iraqgunz View Post
    I run a Sprinco spring in my 20" rifle. It works just fine. The rifle is a lot more forgiving than the other gas systems.
    Any idea if the sprinco green is comparable to the Wolff XP?

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    No idea to be honest.

    Quote Originally Posted by masakari View Post
    Any idea if the sprinco green is comparable to the Wolff XP?



    Owner/Instructor at Semper Paratus Arms

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    Not that there's anything wrong with upgrading the buffer spring, but on a 20" rifle it shouldn't be necessary.

    I have an A1 clone built with a CMMG 20", A1 profile, chrome lined, 1:7 twist barrel. CMMG doesn't make those barrels anymore (I built this around 2009). It has a standard rifle spring and rifle buffer, with a semi bolt carrier. It won't function properly with PMC, which isn't surprising. Full-power 5.56mm? No problem. Quality .223 like Gold Dot 64gr? Again, no problem. However, it only locks back on the last round about 50% of the time even with those loads. I wouldn't put a FA bolt carrier in it let alone a higher-powered spring. I suspect the gas port may be a little on the smaller side but I'm okay with that over time. Function is fine with the ammo I use but lock-back would turn some folks off.
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    I'm also watching this thread, for slightly different but related reasons. I'm curious to see what the advice is about recoil springs because...

    I just finished assembling an Aero Precision 20-inch A2 clone. The lower was purchased from Aero, the Aero upper was purchased from Brownells. Bolt is a black nitride Aero.

    During my first test session (about 20 rounds of 223 ammo), the gun short stroked (was not always striping rounds from the magazine) a few times. I cannot remember if the bolt ever failed to lock back during the session.

    I plan to also retest the same 223 ammo with another rifle (not carbine) lower I have. I also plan to retest with some 5.56 ammo. I have read somewhere that the rifle might need 100 or so rounds to "break in."

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    Sprinco green in both my fixed restock rifles and A5 kits

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    A standard spring allows the bolt carrier group to recoil in proper timing and, once compressed, NOT slam the bolt carrier group back into battery so fast that the magazine spring can't push the next cartridge up, disrupting the feed step in the cycle of operation. Some stiff springs may prevent the bolt carrier group from moving far enough to the rear for the bolt catch to rise and stop in its proper position on the bolt face, preventing lock-back.

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    Quote Originally Posted by sinister View Post
    A standard spring allows the bolt carrier group to recoil in proper timing and, once compressed, NOT slam the bolt carrier group back into battery so fast that the magazine spring can't push the next cartridge up, disrupting the feed step in the cycle of operation. Some stiff springs may prevent the bolt carrier group from moving far enough to the rear for the bolt catch to rise and stop in its proper position on the bolt face, preventing lock-back.
    Sounds like I probably need to buy a regular spring!

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