jessmc696 Posted October 28, 2006 Share Posted October 28, 2006 Well, I just got my new M1 18 1/2" barrel with the ghost ring sight ( after a 6 month wait) , however just noticed that the new barrel has 2 major differences from the standard m1 barrels. first is the barrel retention ring that slips into the forearm it is 1/2 longer and a barrel band of some sort on the exterior towards the chamber. and thus the original forearm does not fit. My S90 M1 has a serial no.M490xxx. I did some research and ordered a forearm from Brownells but its for a post m155xxx. My question is do I have a post or pre barrel? It bothers the crap out of me to wait 6 months for the barrel only to find out the dang forearm doesnt fit.... Quote Link to comment Share on other sites More sharing options...
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