Forearm for M1 Tactical

[jessmc696]

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....

[d]

I do not know how to help but try checking out this parts diagram:

ftp://ftp.benelli.it/Public/UM_SPL/G0191801.PDF

and this website:

http://www.e-gunparts.com/products.asp?chrMasterModel=4150zM1%20SUPER%2090%20MILITARY%20AND%20POLICE

 

and see if you can figure something out. Good luck.

[jessmc696]

Thanks for the diagram, didnt say which one would fit. Went and looked at a friend's M1 with the 18 1/2 RS, his barrel does not have that barrel stop looking thing, Hopefully the forearm I ordered will fit, otherwise gonna have to break out ye ol dremmel........