338 FED Build Help

[Quiet6.8]

Hello The SnipersHide,
I have been slowly gathering parts for a 338Federal AR10 build. So far I have a 16” Wilson Combat with intermediate gas, a standard 2aArmament Ti gas block, and a heavy (tungsten)JPSCS. I have on order both a 2aArmament Ti regulated BCG and a JP variable mass BCG (standard). If I chose to run the JP BCG will I need to install an adjustable GB? Or will the combination of the heavy SCS along with the variable mass BCG suffice? Would I need to upgrade to the tungsten BCG weights? This build will be run suppressed with a SiCo Hybrid46.
Thanks for your input,
Cris from UT

 

[bfoosh006]

IMHO, It will depend on your gas port size.

I am not familiar enough with a 338 Fed. barrel to offer any meaningful advice.

FWIW... I run Adj. GB's on all my Large Frame AR's.... various brands and barrel lengths, various gas system lengths ( mid and rifle ) in both 308 and 6.5CM

That said, I have only one Large Frame barrel that has had what I consider a "appropriate" gas port size... The Krieger.

My FN's , Criterion's , Faxon, BA, PSA barrels, all have been "over-gassed" to me and have SLR Adj. GB's with heavy buffer weights and Tubbs Flatwire 308 recoil springs.

 

[mheimer_45]

Is there any reason you don’t want an adjustable gas block? I’ve got over 15 in my stable of various brands. My preferred are jp and larue.

 

[Quiet6.8]

Is there any reason you don’t want an adjustable gas block? I’ve got over 15 in my stable of various brands. My preferred are jp and larue.

The 2aArmament RBCG has a gas adjustment screw in the carrier, so an AGB is not needed. That was my planned BCG until I did some research on the JP VMBCG, but with the additional reciprocating mass I was unsure if one was needed