Need to adjust the gas when you change the reciprocating mass. But I know what you meant, just mixed it up going from brain to type
Sqr, you are 100% correct that with an AR with standard components an adjustable gas block is not needed and simply changing a buffer or buffer spring is usually enough to smooth out a hard cycling gun or get one locking back reliably if it's short stroking.
The op mentioned a titanium carrier which while I like you see no need for this guy wanted one so now he has to be able to compensate for throwing the system out of balance.
I personally think the only issue he has since it cycles factory loads well is his reloads may need a different powder. I use 4198 in my bolt action under a 36gr Varmint grenade it may not be the best choice for an AR with 55gr projectiles. I'd have to go check my burn charts and loading logs to see if I've ever used it in a semi or with heavier bullets but I seem to remember it being pretty fast.
4198 is very fast for larger capacity bolt guns but is a tad slow for light 22 caliber projectiles in DI Rifle length AR type rifles. The burn rate is close to win 748, H335, RL7-10, IMR3031, CFE BLK (which I am fond of) H4198. As was pointed out and I had not mentioned CFE 223 and BL-C(2) are good.
However each setup is different and a shooter needs to try everything to develop an optimum load for his particular setup. Trial and error is the way to accuracy and functionality.
These are some of the powders I use and have tried with mixed results in the .223/5.56
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