Buttstock needs the floppy sling mount and no trapdoor.
Can't tell from pic but fine pitch knurling on bolt release paddle and no nubbin on the bottom would be more correct to a slabside repro
Gotta wonder if a talented welder could put basically a washer or heavy ring on the end face/tips of a 3~prong to convert it to a brake.
Its legit with that 'A1' Branson type so can't see how it would differ on a pronger.
If successful it would also have the side benifit of completely removing the desire to try and open a soup can or cut barbed wire with it
@defilade
The XM and #'d series rifles and carbines were never rattle traps when new.
If anything they were tighter in general tolerance and over the decades we've worked out where things can be free'd up.
The ones that still survive in service (yes, they are indeed out there) might be a bit bag 'o boltsy now, but I imagine a NIB today Colt, BCM, DD etc. will be too after 30~40 years, tens of thousands if not 100k+ rounds and who knows how many times dropped, muddied, drowned, sanded, dusted, sat on, stepped on, leaned on, fell on, pried with, slammed in doors, slammed on doors, drug and bayonet course runs in an active duty service life.