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  1. #1
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    Question Fitting a free float M-Lok or quad rail to a Smith & Wesson M&P 15 Sport 2 with a FSB

    Good day. I am considering buying an AR-15 type rifle for DMG. I was considering the above mentioned rifle but would like to install a free float rail at some stage. How difficult and costly will this typically be and could one keep the fixed front sight? Also, would the fixed front sight interfere with a RDS? The reason I am asking is that I can get a Sig Sauer M400 elite (without the RDS) with a free float M-Lok handrail for about R25k, and although initially outside of my budget I might reconsider it should the hassle of fitting a free float be too much. I have not owned any semi-automatic rifles before so my experience is quite limited.

  2. #2
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    Default Re: Fitting a free float M-Lok or quad rail to a Smith & Wesson M&P 15 Sport 2 with a

    It is a simple thing to fit the new gas block (you cant typically keep your a2 front sight) and the hand-guard yourself if you have a modicum of mechanical aptitude. Locally you should be able to get a low profile gas block and rail for less then R2k.

  3. #3
    Member pdh's Avatar
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    Default Re: Fitting a free float M-Lok or quad rail to a Smith & Wesson M&P 15 Sport 2 with a

    Price ranges:

    Rail = R1.5k to R5k

    Gas block = R500 to R900

    Gun smithing about R1000 (not clear on this as I do everything in house)

    Its a pretty painless process but I have found some A2 posts to be a bitch to remove (Norincos come to mind)
    Youtube: pdh BeepRunShoot Twitter: @pdhBeepRunShoot Instagram: pdh_BeepRunShoot

  4. #4
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    Default Re: Fitting a free float M-Lok or quad rail to a Smith & Wesson M&P 15 Sport 2 with a

    I have seen a A2 post being cut off with a hack saw, because it was in the way of the scope.

  5. #5
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    Default Re: Fitting a free float M-Lok or quad rail to a Smith & Wesson M&P 15 Sport 2 with a

    Having been though this process with my Sport 1. A couple things to know:

    S&W Roll Pins in the FSB knock out in the opposite direction to what is generally standard in AR15's (I can't remember the exact direction, but google will tell you, as well as how many people have knocked roll pins the wrong way).

    Those roll pins are also in there very very tightly, Paul Oxley & Myself tried everything to get the FSB off, eventually we decided to just cut the Front Sight Post & Bayonet Lug off to clear the Free Float Rail.

    The gun is 3 years old, and has about 12k rounds through it, and there is no issue. Some might even say it's the better way to do it as the Gas Block remains pinned in place, which many Low Profile Gas Blocks don't cater too.

  6. #6
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    Default

    Quote Originally Posted by Stevin View Post

    Those roll pins are also in there very very tightly, Paul Oxley & Myself tried everything to get the FSB off, eventually we decided to just cut the Front Sight Post & Bayonet Lug off to clear the Free Float Rail.
    It sounds like Paul is a master, was it not him that fix a gun with a grinder at a Idpa match? Did you guys use a grinde or a hacksaw? LoL.

  7. #7
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    Default Re: Fitting a free float M-Lok or quad rail to a Smith & Wesson M&P 15 Sport 2 with a

    Quote Originally Posted by Vaal View Post
    It sounds like Paul is a master, was it not him that fix a gun with a grinder at a Idpa match? Did you guys use a grinde or a hacksaw? LoL.
    Lol, yeah it was but it seems he has gained a little finesse since then... a Dremel was used

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