AngelDeVille Posted March 28, 2015 Report Share Posted March 28, 2015 So on my "varnimter" ar15 I have an unknown brand of receiver, and works great, but it's .025" taller than my handguard at the rail. The receiver is an overbuilt (fatter) with no FA and dust cover. (Does anyone know who made it?) The handguard is a UTG pro 15.5" I have fitted it with a Magpul front and Matech rear BUIS and I have no concerns with sighting. I would prefer to use 45 degree A2 sights, but I'm concerned the rail height difference would seriously impact long range adjustments with that set-up. I could run the 45's on the handquard without too much difficulty. Can anybody think of some fixes? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 28, 2015 Report Share Posted March 28, 2015 0.025' isn't a big difference when on the same plane. With 45* offsets, you're into two different axis that you have to comp/adjust for. There's enough elevation adjustment to make it work on the same plane, so there will be enough elevation adjustment to work with the 45* setup. You should have enough windage adjustment in the rear sight to make the 45* setup work on your rifle. Ultimately, the best fix is a rail system that matches the upper receiver height. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted March 28, 2015 Report Share Posted March 28, 2015 .025? That's smaller than 1/32" (it's actually 1/40", or 0.635mm, if that's even a real measurement)... did you mean .25 (1/4") or .125 (1/8")? Those would be significantly larger differences. If it's truly a .025" difference, I doubt nearly a half millimeter will affect much, even with 45° sights, under 100 yards. Quote Link to comment Share on other sites More sharing options...
AngelDeVille Posted March 28, 2015 Author Report Share Posted March 28, 2015 0.025' isn't a big difference when on the same plane. With 45* offsets, you're into two different axis that you have to comp/adjust for. There's enough elevation adjustment to make it work on the same plane, so there will be enough elevation adjustment to work with the 45* setup. You should have enough windage adjustment in the rear sight to make the 45* setup work on your rifle. Ultimately, the best fix is a rail system that matches the upper receiver height. The handguard was level with a standard M4 upper so the problem child is the bastard upper I'm using. I could change the upper, but I kinda like it. .025? That's smaller than 1/32" (it's actually 1/40" if that's even a real measurement)... did you mean .25 (1/4") or .125 (1/8")? Those would be significantly larger differences. Here's the pic of my set up and micrometer. So if I had her sighted in with the large aperture at 100 meters then flipped to the long range, then adjusted the elevation wheel to 400-800 meters, where would I have impact issues? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 28, 2015 Report Share Posted March 28, 2015 So if I had her sighted in with the large aperture at 100 meters then flipped to the long range, then adjusted the elevation wheel to 400-800 meters, where would I have impact issues? That kinda doesn't matter - you're not shooting 800 meters with iron sights unless you're a competition guy. If you're a competition guy, you won't be doing it with that rifle, and making successful competition scores. me thinks you needs de Space Gun setup. That's my final answer, Regis. Quote Link to comment Share on other sites More sharing options...
AngelDeVille Posted March 29, 2015 Author Report Share Posted March 29, 2015 That kinda doesn't matter - you're not shooting 800 meters with iron sights unless you're a competition guy. If you're a competition guy, you won't be doing it with that rifle, and making successful competition scores. me thinks you needs de Space Gun setup. That's my final answer, Regis. Does the space gun set up require the use of duct tape? I'm in! I think I'll try sighting it in with the offsets, and see if it holds zero between the 100-200 aperture and then flipping to the LR at 300. If it does that well I'll consider it a success. Even though I have Warne QD rings on both my scoped rifles I really don't want to remove the scope, then flip up the back up sights in order to engage a close range target. Call me lazy.... Quote Link to comment Share on other sites More sharing options...
shibiwan Posted March 29, 2015 Report Share Posted March 29, 2015 That upper looks like it was made out of a DPMS extrusion.... Quote Link to comment Share on other sites More sharing options...
AngelDeVille Posted March 29, 2015 Author Report Share Posted March 29, 2015 (edited) That upper looks like it was made out of a DPMS extrusion.... It's ugly as sin too, the handguard had "ears" that fit over the sides of a regular upper, and I had to remove them to fit this upper. I can't see any marks or symbols anywhere, I even looked on the inside under the charging handle. Edited March 29, 2015 by AngelDeVille Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 29, 2015 Report Share Posted March 29, 2015 That upper is the DPMS slickside upper. I have the same one on my 9mm. Quote Link to comment Share on other sites More sharing options...
AngelDeVille Posted March 29, 2015 Author Report Share Posted March 29, 2015 Thanks, now I know who made it! It's like a pretty fat girl. Quote Link to comment Share on other sites More sharing options...
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