It's all about the harmonics. Barrels vibrate when a round is fired, and the vibrations are affected by barrel weight, strenght, length, etc. So, fixing or retracting a bayonet may make a rather hefty difference in how the barrel vibrates, thus altering the coincidence between point of impact and point of aim. I don't think it'd change your group size, at least not significantly so, but it is very possible it'd alter your POI a good deal.
Ted, I was referring specifically to the extension/retraction of an M44's bayonet. Harmonics affect group size a great deal (hence the varied barrel contours available, bedding, floating, the BOSS you mentioned, etc.), but specifically the bayonet of an M44 may or may not affect group sizes a whole lot.
Of course, let it be known that I have ZERO experience with the M44, and what I've posted is only general knowledge collected through my own experience with firearms and accounts posted by other users. I have yet to see a testimony verifying that bayonet position (in reference to the M44) has a substantial impact on group size. However, I have seen convincing accounts that it does alter POI measurably.
The BOSS is a system that includes (primarily) a muzzlebrake which may attach to the threaded end of a barrel. It can affect accuracy by means of the brake itself, but also by the additional weight of the brake screwed onto the end of the barrel. Chuck Hawks has a pretty good article about it that's worth a read, if you're really interested.
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