Shooting an Alex Arms Upper in 6.5 Grendel
and a Bushmaster Lower. After about 5 rounds- all of which feed fine, the BCA jams. After opening the rifle the Buffer retainer pin and its spring are found under the bolt. The buffer retainer spring is destroyed.
So I obtained a new Wolf Buffer spring, new retainer pin and spring, new buffer, and new bufffer tube from Brownells.
I tested the rifle and cycled the Bolt several times, and there was no problem. The Buffer retainer pin held its position under the edge of the Buffer tube which was thoroughly screwed in tight.
So at the range today, the same thing happened after about 5 rounds. The buffer retainer pin popped out, the buffer pin retainer spring was jammed under the BCA.
My loads are really not hot. Using Lapua Brass, 27.2 Gr of VV N140 and 123 gr 6.5mm Laupa bullet, and CCI primers.
What is with the Buffer system and how do I fix it? hve gone through 2 sets of parts...Is it the BCA?
Thanks. I know there is an expert here who can help out.
and a Bushmaster Lower. After about 5 rounds- all of which feed fine, the BCA jams. After opening the rifle the Buffer retainer pin and its spring are found under the bolt. The buffer retainer spring is destroyed.
So I obtained a new Wolf Buffer spring, new retainer pin and spring, new buffer, and new bufffer tube from Brownells.
I tested the rifle and cycled the Bolt several times, and there was no problem. The Buffer retainer pin held its position under the edge of the Buffer tube which was thoroughly screwed in tight.
So at the range today, the same thing happened after about 5 rounds. The buffer retainer pin popped out, the buffer pin retainer spring was jammed under the BCA.
My loads are really not hot. Using Lapua Brass, 27.2 Gr of VV N140 and 123 gr 6.5mm Laupa bullet, and CCI primers.
What is with the Buffer system and how do I fix it? hve gone through 2 sets of parts...Is it the BCA?
Thanks. I know there is an expert here who can help out.