04-23-2018, 04:08 AM
1st up was my brothers grendel. Broke extractor. AA 16 barrel and AA hard use bolt wolf steel cased at time of failure. At this point the rifle has probably around 1k rounds through it. Admittedly mostly steel case. Im thinking maybe laquer build up in the chamber causing some difficulties to extract? Chamber looked good to me so we slapped in my spare group buy bolt and kept rockin.
Next is not a grendel but a 300 blk ar pistol. I put it together for a friend and the main issue is it goes full auto. I checked the FCG for function and the disconnector catches fine by hand. It wouldnt do it every time and it does not run away (empty mag). As soon as i released the trigger it stops with a round in the chamber and the hammer back. I swapped his upper to my lower and it ran fine. I put my upper on his lower and it ran fine. His LPK is a strike industries if anyone has had or heard of problems please chime in. The disconnect is a little rougher than my others when depressed by hand so maybe its getting hung up sometimes?
This was this builds first trip but it is not my first build. To add to the hurt, the bolt catch doesnt LRHO every time and the buffer is hitting the buffer detent in operation beating up the buffer. I plan on honing the disconnect and bolt catch. Only thing i can think of to fix the buffer issue is put some kind of plug in the back of the bcg to essentially shim the buffer back a few thou when assembled. I feel like the victim of some serious tolerance stacking or something but i guess thats the risk when you build buying from sales rather than buying quality. Id like to know if yall have any thoughts that could help me any further.
Next is not a grendel but a 300 blk ar pistol. I put it together for a friend and the main issue is it goes full auto. I checked the FCG for function and the disconnector catches fine by hand. It wouldnt do it every time and it does not run away (empty mag). As soon as i released the trigger it stops with a round in the chamber and the hammer back. I swapped his upper to my lower and it ran fine. I put my upper on his lower and it ran fine. His LPK is a strike industries if anyone has had or heard of problems please chime in. The disconnect is a little rougher than my others when depressed by hand so maybe its getting hung up sometimes?
This was this builds first trip but it is not my first build. To add to the hurt, the bolt catch doesnt LRHO every time and the buffer is hitting the buffer detent in operation beating up the buffer. I plan on honing the disconnect and bolt catch. Only thing i can think of to fix the buffer issue is put some kind of plug in the back of the bcg to essentially shim the buffer back a few thou when assembled. I feel like the victim of some serious tolerance stacking or something but i guess thats the risk when you build buying from sales rather than buying quality. Id like to know if yall have any thoughts that could help me any further.
