Yeah, I prefer an FA version...but only due to the added mass it would bring. however, if the SA version is the same mass as the FA then I want whichever is cheaper, lol. I honestly need to familiarize myself more with LMT's 7.62 SKU codes.
I use an LMT enhanced carrier on my 11.5" 5.56 suppressed, my 16" intermediate gas suppressed, and my 18" rifle gas suppressed/unsuppressed without a single issue. In fact, the 11.5" suppressed and 16" BRT Optimum barrel intermediate gas suppressed share the exact same A5 equipped lower.
I would submit that the longer dwell time would be beneficial due to the increase in pressures we've seen with commercial .308 Win ammo, which I intend to use, as compared to the std ball used during the original AR10's development. I also think it's no accident that these enhanced BCG's were a specifically called-out item for the LMT L129A1 and LM308MWS contracts according to some sources I have. For the later contract, the likes of the HK417 and FN SCAR-H were beaten (and others). The LM308MWS contract competition required full function with both RG 155gr and M80 FMJ.
So, considering the breadth of ammo power within what constitutes a US available .308 Winny commercial loading, I think that the added dwell time from the modified/lengthened cam-pin track, the twin-entry gas manifold ports into the toroidal expansion chamber from the gas key, the three exhaust ports, and the added 4th exhaust port that vents directly from the expansion chamber......these are all very good things for both reliability, parts life, and they just can't do anything bad to accuracy either (though I certainly don't have any data to show they aid it).
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