I have heard of putting a piece of felt on the face of the bolt to soften the closure sound - never tried it though [it could be one of those Hollywood 'facts'].
I cast my mind back to those Smith & Wesson 9mm M59s that SEALs used in Vietnam to shoot sentries, dogs, etc; the slide had a locking bar that the user could rotate up to engage the slide and stop it from moving. Thus the shot would be quiet and only hammer noise would occur. Why not try a variation of that theme and investigate a mechanical locking device that positively locks the bolt forward; it would absorb the recoil forces so it would need to be over-engineered.
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Mike
When you're wounded and left on Afghanistan's plains
And the women come out to cut up what remains
Just roll to your rifle and blow out your brains
An' go to your Gawd like a soldier.
Rudyard Kipling.
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