Unbreakable

Ordered a ghost ring rear sight assembly for my M1S90. Does anyone know of a good smith that handles Benelli regularly that can drill and tap my receiver and install the rear sight for me? I really want to deal with an expert on this. Thanks in advance for any info.

Ok all, I have an older HK M1S90. I want to give it a complete cleaning and maybe even replace the recoil spring as the weapon has about 1,000 rounds through it. But I can't for the life of me figure out how to get this recoil assembly apart. It's completely round and does have anything resembling a nut. I mean there was a 13mm nut that held the stock on... but the recoil tube is round and smooth. I assume I'll have to heat it up to break it loose. But what part do I heat up and with how much heat will hurt the metal? How do I turn it once I've heated it up? I appreciate any info or detailed pics on this.

What's the capacity on one of those... I've seen photos of them and the end of the mag tube looks funny... does it hold 6? 8? will it do the little trick of letting one ride between the bolt and feed ramp for an extra round? The M4 looks cool.

Getting an HK M1S90 today. It's got like a 24 or 26" barrel. I am wanting to get an 18.5" barrel for it. Any ideas on where to find one to buy or trade for one? Thanks.

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Hey all. Love the forum. I have a 121 M1. I need info on this shotgun. Can M1 Super 90 parts work in it? Can the 121 be modified to take super 90 stuff? I saw a past post on here where a member put new synthetic furniture on his 121. Where can I get this furniture... will the pistol grip stock work. Thanks in advance for any info.