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1. #Smith and wesson piston ar 15 quad rail handguard install#
2. #Smith and wesson piston ar 15 quad rail handguard full#
3. #Smith and wesson piston ar 15 quad rail handguard pro#
4. #Smith and wesson piston ar 15 quad rail handguard free#

Play around backing off the HG about another 30 degrees further from rail alignment, then tighten the lock ring forward against the HG snug. This is where you use your 'estimation'. There will be a small gap (mm+) between HG and upper continuous rail. I found out you'll have problems with tolerances around your takedown pin space. Do not thread HG against upper receiver, even if it fits perfect.

#Smith and wesson piston ar 15 quad rail handguard full#

Screw the handguard lock ring (threaded outside the bbl nut) full rearward toward the upper receiver to keep out of the way during HG install. I used 1 drop blue loctite on handguard threads. Handguard screws on to barrel nut (lots of threads).

Remove the handguard set screw at the bottom rear rail.

#Smith and wesson piston ar 15 quad rail handguard install#

Install barrel nut/gas block&tube according to standard rules You will need a strap wrench (cloth one is best). So I thought to mention that (I have to remove 4 crush washers - my poor planning). THESE MUST BE INSTALLED BEFORE THE MUZZLE. They attach to the open end of the rail with 4 tapered screws (to prevent things from getting into the handguard area - if you desire), and the caps have 2 small set screw against the barrel. If you want them, ohhunts makes and sells them too.

#Smith and wesson piston ar 15 quad rail handguard free#

Mid $300's for 10 free float handguards.īear in mind these are set up to receive the rail end caps. But the tubes all passed through and everything seats fine. The ONLY thing I found was a slight variance in the HEIGHT of the gas tube holes when torquing (the gas tube would tap the receiver entrance on the top side (I have a cheap flex video scope). Only thing is there is no instruction - though I watched an identical handguard install online (same mfr I presume). Finding these was an unexpected surprise.

#Smith and wesson piston ar 15 quad rail handguard pro#

I had inadvertently bought barrels with dedicated pinned low pro gas blocks, making free float a necessity. I think they may just keep these, unless very particular. Trying to keep the investment as small as possible (when sold, new owners will customize every part to their favor). The price for these rails is outstanding. At the time of this review I have all the ohhunt barrel nuts installed and 4 of the handguards.

This Geissele free-float rail is a high-quality addition to your AR-15.South Georgia & South Sandwich Islands (USD $)

If you acquire all of the tools necessary to install a free-float rail system, you also have all of the tools necessary to build your own upper from scratch.īe prepared to have all of your shooting buddies bring you their rifles to install their rail systems. Tools required to install a free-float system include: This would be a great time to replace any part of your upper assembly like the barrel, flash suppressor, gas block and front sight since you would be removing everything. You will usually need to remove the flash suppressor, front-sight post or gas block, gas tube, delta-ring assembly and barrel nut. They are usually one complete piece that mounts to a replacement barrel nut. The new rails are a direct replacement for the plastic handguards.įree-float rail systems require more work. You need three hands, a friend or a handguard-removal tool such as Promag’s AR-15 and M16 forearm removal tool.

Sounds easy, but the spring behind the delta ring is strong.