18" Barrel Rifle Length Gas System (RLGS) vs MLGS

[LRRPF52]

LRRPF52 - Would you tune a gas block, or the carrier on a MLGS?

I switched over to a JPSCS and put a heavier spring in and I do notice the return to battery recoil on both my PF 18" Neptune VIII and 24" Lilja. Been pondering going one step under the "standard" spring and closing off the gas port a couple clicks.

I also have a Bootleg carrier that came with my 24" Lilja find. That one I have not messed with yet, just dialed in the gas block.

If the port is cut right for the loads you're shooting in MLGS/18", there shouldn't be a need to mess with it.

It it's getting too much gas, too fast, and causing early unlocking, you can:

* Use a reduced load or lighter projectile
* Choke the gas
* Increase buffer weight
* Increase spring weight

The first option will give you the best results. My Lilja 318 with 31.5gr of CFE under a 123gr really is outside of the window it needs to be, with too fast of a cyclic rate. With a max load of CFE223 under the 95gr Controlled Chaos, it's a pussycat, like shooting a Ruger 10/22.