I have a BCA side charging 300blk in a 16in barrel with carbine length gas port opened to 1/8 inch. I have tried three different kinds of ammo all full house loads and it keeps showing under-gassed. Dropping the brass at 4:30-5 o'clock and not grabbing the next round. I have tried three different mags still nothing. Two different weight projectiles and its the same. I have a stock PSA buffer spring with a buffer that weight is 3.00 at the post office.
I think I need a lighter spring and or buffer but I am having no luck finding anything in stock that I can justify buying. I have found many 70-120 dollar buffers that are lighter but its only a Bear Creek Arsenals. I was even thinking of cutting a few coils off the spring. Do you guys think this is the way to go or perhaps something else?
I should add I pulled it apart to make sure the gas port was clear and aliened. Looked ok but the SS gas tube hole was much smaller then the gas port and thought perhaps I should open that up a bit. I have checked the bolt and the pistons look good and stand on its own. Kind on a fence here since it was a gift from the kids since dad been talking about a 300BLK for months now. I have to make it work because they got it for me. Most online stuff states stock spring and buffer for a 223/5.56 should work. I even tried my buddies lower that is a S&W 223 stock and it did the same thing. Any help would be nice. Thanks in advance I am no expert when it comes to this kinda gun.