Hey everyone - I attempted to build my own AR15 with a bunch of parts. I got it all assembled, and upon firing a test round (both .223 practice ammo and 5.56 NATO ammo), the bolt carrier group wouldn't lock fully back, it stopped around 75-80%. Original specs were as follows -
Criterion .223 Hybrid Wylde Barrel 18"
BCM Discount Blemished Upper
Aero M4E1 Lower
Superlative Arms Adjustable Gas Block
Expo Arms Nitride Bolt Carrier Group
Armaspec Stealth Recoil Spring Gen 4 H Buffer 3.8 oz.
Fiddling with the adjustable gas block didn't prove to be successful, so I switched out the Superlative adjustable gas block for an Aero fixed gas block and had a gunsmith set it properly. Still no luck, the same problem occurred - bolt carrier group wouldn't lock fully back and got stuck in the same position. On my next step, I'm changing out the Armaspec Stealth Recoil Spring H buffer and ordered a Sprinco White buffer spring and a 3 oz. Luth-AR Carbine buffer weight. As luck would have it, I received a white/red Sprinco buffer spring and not the basic white one. So, if you've had experience with Sprinco recoil buffer springs, should I give the white/red buffer spring a try, or should I just exchange it for the white one I originally ordered? Any other suggestions as to what might not be working properly?
Criterion .223 Hybrid Wylde Barrel 18"
BCM Discount Blemished Upper
Aero M4E1 Lower
Superlative Arms Adjustable Gas Block
Expo Arms Nitride Bolt Carrier Group
Armaspec Stealth Recoil Spring Gen 4 H Buffer 3.8 oz.
Fiddling with the adjustable gas block didn't prove to be successful, so I switched out the Superlative adjustable gas block for an Aero fixed gas block and had a gunsmith set it properly. Still no luck, the same problem occurred - bolt carrier group wouldn't lock fully back and got stuck in the same position. On my next step, I'm changing out the Armaspec Stealth Recoil Spring H buffer and ordered a Sprinco White buffer spring and a 3 oz. Luth-AR Carbine buffer weight. As luck would have it, I received a white/red Sprinco buffer spring and not the basic white one. So, if you've had experience with Sprinco recoil buffer springs, should I give the white/red buffer spring a try, or should I just exchange it for the white one I originally ordered? Any other suggestions as to what might not be working properly?