I'll find out & hopefully post tomorrow.
I use an A2 stock w/CAR buffer & A2 spring (I have a CAR spring & M1S's modified buffer but haven't seen need to use them yet).
It cycles very reliably w/all supers & subs & sometimes holds open on last shot (w/subs-always w/supers).
However when I shoot full power loads thru it the recoil isn't bad.
A little more than w/A2 buffer but you have to be "feeling" for it.
Paul says 100% reliability w/M1S modified 300-221 buffer & spring w/subsonics & will always hold bolt open on last shot but to not shoot full power loads.
My theory is to deer hunt w/125g supersonics (& no suppressor).
My gun cycles 100% w/a little more recoil.
When hogs/coyotes/bobcat come in, simply change to subsonic mag, attach suppressor, rack out super sonic load and shoot subs w/100% reliability.
If bolt doesn't hold open on last round I do not care as I think this package is a GREAT compromise.
I'll also try to post some targets tomorrow.
There are a lot of good options out there.
If you haven't bought yet, you should give M1S a chance.
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