450 upper build help
Posted: Wed Apr 29, 2020 12:03 pm
I bought a Bushmaster 16 inch complete upper back in 2015. It broke on me (long story probably for another post), but now I found a 20 inch Bushmaster 450 barrel for sale at CDNN that I couldn’t resist.
So I plan on changing out the barrels, and re-using everything else except the gas block. The barrel is what went bad on the previous upper. The old syrac ordinance detent adjustable gas block I have locked up and the Allen screw stripped out.
I want to use an adjustable gas block but I saw a post somewhere on this site saying it is not recommended on this barrel because of the long dwell time on the 20inch barrel with carbine length gas system.
Questions:
-should I use an adjustable gas block and what brand/style is recommended. I’m leaning towards ODINWorks
-do I need to check headspace. I’m thinking I should buy a field gauge just to be safe.
So I plan on changing out the barrels, and re-using everything else except the gas block. The barrel is what went bad on the previous upper. The old syrac ordinance detent adjustable gas block I have locked up and the Allen screw stripped out.
I want to use an adjustable gas block but I saw a post somewhere on this site saying it is not recommended on this barrel because of the long dwell time on the 20inch barrel with carbine length gas system.
Questions:
-should I use an adjustable gas block and what brand/style is recommended. I’m leaning towards ODINWorks
-do I need to check headspace. I’m thinking I should buy a field gauge just to be safe.