Does the barrel have a pistol or carbine length gas tube?
I've found the pistol length spit out a bunch more than carbine.
If it's pistol length, an adjustable gas block is probably your best bet as this length is the hardest/fastest recoil.
If it's carbine length, a gas block is easy.
If it's carbine length and slams back in addition to spitting lots of gas, you might check the buffer spring and go slightly heavier.
The reason I say check spring is that lately I've found buffer springs to be all over the place as far as spring rate.
I'm not just talking about carbine vs rifle length/rate.
There are all kinds of variations these days with pistol cals, rifle cals and everything in between.
Not to mention all the off-shore variations with lack of quality control.
Texans since The Old 300 in 1824
NRA Lifetime Member