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What size plug screws does the M1 take to hide the rear taps for an LPA GRS? Going to be using a Vent rib barrel and I want to protect the threads and keep any possible gas/vented debris from hitting me in the face.

So I splurged on a "new" M1 field barrel, its pretty nice. However, the synthetic forend my M1 came with wont fit it, it seems the lug the magazine extension ring is welded to is longer than the old GRS barrel's lug. If I modify the forend to fit the longer lug, will it keep me from using the GRS barrel or does a longer channel not matter?

Hi, awhile back I got a used police M1 that came with a GRS barrel and rear LPA sight. Great for the range and HD, but now I want to take it out on the marsh to bag waterfowl and bust up some clays at the range. Hit me up on PM if you have anything, looking in the $270-400 range range pricewise for the barrel, the finish doesn't have to be great since the gun itself is pretty ratty on its own. I'd prefer an actual M1 barrel vs doing the M2 barrel + forend swap though I'm still open to M2 barrels if you have one handy.