Tips for improving..
accuracy of the m100.
Remove action from stock,
route around the location of the gasblock on barreland glass-bed it, (this will minimize movement, also leave vent area front & back, let gas escape for functioning)
Scrape barrel channel to free float,
at the forearm thru-hole for the barrel lug, rout on backside of hole and coat the barrel,lug-screw & lug with release, then glass-bed the back-side of the hole.
Lower barrel and screw as normal placing two thicknesses of business card at the forearm tip and barrel, just snug the screw down and let cure.
remove card stock and visually inspect to confirm the glass-bed as good impression of barrel lug.
Reassembled and shoot it.
I done this to my 100's & 88'sall will cloverleaf @ 200 from prone position with my hunting handloads.