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300blkoutnewbie · February 3, 2013, 10:52 AM

I just recently finished my 300 blackout upper for my AR-15. I took it to the range the other day to sight in the scope. I was shooting 110 gr supersonic ammo. The rifle fired however it did not cycle the next round into the chamber. The rifle ejects the spent round and everything it just seems as if the bolt doesn't come back far enough to pick up the next round. I am running a 16" barrel with a carbine length gas system. A gentleman at the gun store suggested clipping the buffer spring, changing the buffer, and possible boring out the gas port in the barrel. I switched out the buffer but am a little wary about cutting my buffer spring or drilling out the gas port. I dont want to do anything that may inhibit the .556 upper that I have for the same AR. Any ideas on if clipping the buffer spring would affect the .556 upper and it will help the .300 blkout?

February 3, 2013, 10:52 AM	#1
300blkoutnewbie Junior Member Join Date: February 3, 2013 Posts: 4	300 Blackout upper help! I just recently finished my 300 blackout upper for my AR-15. I took it to the range the other day to sight in the scope. I was shooting 110 gr supersonic ammo. The rifle fired however it did not cycle the next round into the chamber. The rifle ejects the spent round and everything it just seems as if the bolt doesn't come back far enough to pick up the next round. I am running a 16" barrel with a carbine length gas system. A gentleman at the gun store suggested clipping the buffer spring, changing the buffer, and possible boring out the gas port in the barrel. I switched out the buffer but am a little wary about cutting my buffer spring or drilling out the gas port. I dont want to do anything that may inhibit the .556 upper that I have for the same AR. Any ideas on if clipping the buffer spring would affect the .556 upper and it will help the .300 blkout?