Top stock is wood, not fiberglass. It is similar to that found on an 40x .22 rifle, though the bottom of the stock appears different (not inletted for the drop-plate magazine box.) The long oval in the foreend is for an older style handstop setup (see
https://www.egunner.com/remington-m...22lr,name,12487976,auction_id,auction_details for an example.) Two holes at the 4:30 and 7:30 positions are for spring-loaded tuners, typically discarded by many shooters.
Second stock appears to be for the same action. Not sure of material, is missing the handstop cutout, but has the tuner holes. Not sure if the front swivel is for a bipod, or if it was used with a bag riding tool, such as Hart's Accuracy Asset. (
https://www.hartcustomrifles.com/product/hart-accuracy-asset/ )
Third stock appears to be for the same action as well. Again, no idea about material, no tuner holes or handstop rail. The comment about the front sling swivel applies to this stock as well.