Nemesis Lead Posted August 2, 2014 Share Posted August 2, 2014 The title says it all. Will my JP Low Profile Gasblock fit underneath a BCM KMR 15 handguard? My understanding is that there must be a little play as the barrel will move under recoil and/or the handguard could get pushed into the gas block if you are leaning into a position. I would appreciate responses from folks who have done this installation. Many thanks! Link to comment Share on other sites More sharing options...
Headworked Posted August 2, 2014 Share Posted August 2, 2014 I run the KMR BCM 13" and it would not work with any gas block that has a clamp flange on lower side... I wound up buying an SLR Sentry and it worked very well... Link to comment Share on other sites More sharing options...
Headworked Posted August 2, 2014 Share Posted August 2, 2014 There was a half mil to millimeter clearance on the JP and several other gas blocks that I had laying around, but when I would rest the handguard on a barricade and shoot, the barrel would move enough that bolt flange on bottom would contact inside of KMR rail and throw the shot off at any distance.. It stung real bad at Task Force Dagger and cost me lots of points and time Link to comment Share on other sites More sharing options...
Headworked Posted August 2, 2014 Share Posted August 2, 2014 Nemesis lead, Throw a pic up of the gas block you are wanting to use... They show 6 different ones Link to comment Share on other sites More sharing options...
mngunguy Posted August 2, 2014 Share Posted August 2, 2014 So you ended up using a set screw style block? . 750? And even then you're still having issues shooting supported? I've been thinking about teaming this rail up with a 16.5 voodoo barrel but after seeing that most aren't able to get much of a reduction in gas using an adjustable block I may just use a standard low pro block and if need be a rubber city adjustable key. Link to comment Share on other sites More sharing options...
Nemesis Lead Posted August 3, 2014 Author Share Posted August 3, 2014 Hey Head--Which version of the SLR Sentry did you get? If it worked for you, it will likely work for me. Link to comment Share on other sites More sharing options...
NisilS14 Posted August 3, 2014 Share Posted August 3, 2014 (edited) The KMR has inner diameter of 1.3" and the block's height is listed at 1.4", so I don't think it'll work. I'm using the seekins block with a kmr 13, and it clears the handguard. I've only shot it loading up on a bipod but it seems to stay in position well. Edited August 3, 2014 by NisilS14 Link to comment Share on other sites More sharing options...
mngunguy Posted August 3, 2014 Share Posted August 3, 2014 The KMR has inner diameter of 1.3" and the block's height is listed at 1.4", so I don't think it'll work. I'm using the seekins block with a kmr 13, and it clears the handguard. I've only shot it loading up on a bipod but it seems to stay in position well. The 1.3" ID is the width. The height is more than that to accommodate the gas tube and top of the block. Link to comment Share on other sites More sharing options...
Headworked Posted August 3, 2014 Share Posted August 3, 2014 Nemesis It's the sentry 7 premium set screw version... I loctited it, but if you are concerned about it moving, you can have it pinned with a 1/16 Roll pin by a competent gunsmith... I now have no issues with shooting of a barricade and havin to worry about gas block hitting inside and throwing shots off down range Link to comment Share on other sites More sharing options...
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