Question on Switching Gas Blocks

The #1 community for Gun Owners in Indiana

Member Benefits:

  • Fewer Ads!
  • Discuss all aspects of firearm ownership
  • Discuss anti-gun legislation
  • Buy, sell, and trade in the classified section
  • Chat with Local gun shops, ranges, trainers & other businesses
  • Discover free outdoor shooting areas
  • View up to date on firearm-related events
  • Share photos & video with other members
  • ...and so much more!
  • MRE Milkshake

    Plinker
    Rating - 0%
    0   0   0
    Apr 24, 2022
    38
    8
    Indianapolis
    So I currently want to switch the gas block on my S&W MP-15 from the picatinny low profile to the standard A2 f marked gas block. I don't have any experience in doing such a thing, would this be a simple procedure to accomplish or is this something better left done for a gunsmith? I've seen videos showing how to change the gas blocks, but I'm not sure if with whatever this gas block that came standard on the MP-15 would be any different.

    PXL_20220509_232624187.jpg

    Here's a picture of the MP, if that helps any. Any advice would be appreciated, thanks!
     

    Leo

    Grandmaster
    Rating - 100%
    30   0   0
    Mar 3, 2011
    8,656
    113
    Lafayette, IN
    The Basic description is remove any pins, knock the old one off and tap the new one on. That said, there are lots of variables to screw it up. It is an interference pressed fit, it has to be tight, and the vent hole has to be in correct alignment or you will not get correct pressure. Knowing the barrel diameter accurately and matching the right diameter sight is everything. If you are hesitant and don't have someone to help you, another route might be to buy a GI style sight that clamps to your front block.
     

    KokomoDave

    Master
    Rating - 100%
    70   0   0
    Oct 20, 2008
    3,386
    149
    Kokomo
    Tapered pins don't necessarily need to be used if you have a front sight that uses set screws. Small divots will need to be drilled / milled to ensure the fsb doesn't move. Calling AllenM...
     

    NyleRN

    Master
    Rating - 100%
    15   0   0
    Dec 14, 2013
    2,980
    83
    Scottsburg
    Tapered pins don't necessarily need to be used if you have a front sight that uses set screws. Small divots will need to be drilled / milled to ensure the fsb doesn't move. Calling AllenM...
    Probably nothing wrong with that. But for me, if this was my only AR I wouldn't do that. I'd want the front sight on with the taper pins. That way if the rifle is dropped or there's a direct blow to the front sight I can rest assure it's still zeroed and more importantly it'll still cycle and not short stroke. But that's me though. YMMV
     

    Squid556

    Marksman
    Rating - 0%
    0   0   0
    Feb 26, 2022
    152
    43
    North Manchester
    You would have to have a jig to drill the holes for the taper pins. For sure something to be left to a professional. I wouldn't attempt to covert it to a milspec gas block.

    Now there are a few wildcard options out there.....
    This has the look and function of a milspec gas block but it uses a much easier clamp style instead of taper pins. But for the cost....... Might just be better off buying a barrel or upper with milspec gas block already attached like what was shared above.

    This would quickly mount directly to your existing gas block. Fairly painless. This one is kinda expensive but there are others of this style that are cheaper

    Another economic rigid front sight option
     

    NyleRN

    Master
    Rating - 100%
    15   0   0
    Dec 14, 2013
    2,980
    83
    Scottsburg
    So basically I need an entirely new barrel or upper?
    That's an option. Squid556 gave you some other options. I personally would keep the magpuls BUS and sell the forearm and gas block. Then buy a low pro gas block and 15" mlok forearm. That's me though
     
    Top Bottom