14.5” Pinned and Welded w/ FSB to Free Float

[dlee12]

Had this spare 14.5” pinned and welded Bushmaster barrel sitting in the parts bin for a bit, but I wanted to lose the FSB and add a full length rail. I didn’t trust the clamp on two piece gas block designs I’d seen, and had doubts that they’d clear the I.D. Of most rails.

Troy makes a few rails that will mount to a standard barrel nut, so I started there.

Decided on a 13” Bravo rail.

Went to work trimming down the FSB to clear the new rail.

Side note: those cheapy dremel bits wear FAST!

Used a sawzall to get a rough cut and took off the bayo lug and sling ears and the largest part of the front sight.

Squared it off a bit with the grinder.

Combination of dremel and files until everything cleared the handguard and looked fairly even.

Checking clearance.....Ziva approved...excuse the parts bench...in the process of reorganizing...but I’m easily distracted.

Had some rustoleum semi gloss on hand, wiped it down with mineral spirits, masked it off, and gave it a quick spray.

Just waiting on it to cure before I do the final mounting of the handguard.



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[IronBow]

I’ve done this to modernize a rifle with a Troy Alpha rail (the tube with holes) and it worked well. I used an angle grinder on the FSB. You did a much better job of cleaning yours up than I did. Kudos!

 

[Jerzsubbie]

Nice work. I’ve done the same but used the fiber reinforced seemed wheels. They’re just mini cut off wheels and don’t disappear before your eyes like the normal ones.

 

[dlee12]

Upper all buttoned up, slapped on a spare lower and ready to go!

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[Goofyfoot2001]

That is a weapon of war!!!!!!!!!!!!!!!!!!!

 

[dlee12]

Dolled it up a little bit this afternoon... It’s now sitting on a spikes zombie lower with moe grip and Ergo F93 pro stock. Due to astigmatism, I gotta lose the strikefire. Looking at 1-6 scope options.

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