300 Blackout and AA/Osprey pistons
Anyone build a 300 Blackout with either an Osprey or Adams Arms piston kit ? Any issues ?
Not that I have experience in one, but from my research they will not work without tweaking. IMO its better to wait for a specific blackout kit or go with a PWS upper.
I tried an Adams (swapped it from my .223) since I wanted the adjustability.
It worked fine for me (I handloaded to the rifle - no factory available locally), except for when I turned the gas system off, the carbon would bind up the piston and it wouldn't cycle when switching back without disassembly. If you keep it on the half or full gas settings and maintain it, you should be okay. It was scary quiet when shooting subs with the gas system off though.
You are dealing with a faster powder burn rate and that may make you have to open your port up to work multiple ammo types (i.e. subs) that may work in the DI with the smaller gas port.
I didn't notice it being any louder than DI, but evidently the meters of people in the know say it is. DI for the 300 BLK is not a problem since the suppressor blowback dirties up your system anyways.
I switched the Adams back to .223 since I didn't really get any major benefit out of it on the 300 BLK since it is a much cooler system than the .223 due to the smaller powder volume and fast burn rate.
I have a few questions if you don't mind, since I'm also thinking about building one in 300 BLK, what barrel length you were using? I also reload and wondering what powder and bullet weight you were using? You said it works fine with the gas setting either half or full open, how many rounds did you shoot in those two settings? Thanks!