![]() There was visible damage to the 12 o'clock rail on the handguard where the MAWL was mounted that would have accounted for the reported zero shift. ![]() In the thread that got deleted, there was no evidence of any damage to a barrel nut. If you're so worried about all this shit, just get a monolithic upper and call it a day. I've also been told that a big issue was that there was relatively loose fit between the barrel nut and the handguard itself on the MK16s (at least for that batch back then), and when combined with the relatively soft aluminum barrel nut, impacts would permanently deform the barrel nut and cause shift the fact that the legendary MK1s were made with 7075 barrel nuts, and so are the MK4s and MK8s, makes me think that 7075 barrel nuts are fine, as long as tolerances are properly held. Deflection is not just an issue of the rigidity of the handguard itself, but also how it interfaces with the barrel nut, how long the overall handguard itself is, etc., so a cheese grater isn't going to necessarily help much, despite all the extra material. There was a big concern over the M855A1 round cracking uppers that was complete bullshit and came about this exact same way.ĭon't use a giant low profile gas block, and you'll be much less likely to impact the sides of the handguard (it's not a rail, guys) they were using MK12 gas blocks during the tests, IIRC, which barely fit under. I do pair them with small gas blocks when possible but the only real justification I can see for significant concern is MIL usage and even then, there needs to be more data before anyone does anything. But at the end of the day, do you expect your gun to take that hard of a hit, and at the same exact time, your only option is a laser or front sight in a two way shooting incident? When I get into NODs and lasers, they'll likely go on my URX4s but I'm very happy with my MCMRs and MK16s and want more of both. Whether all of that results in a dramatic POI shift for your setup may be entirely dependent on the sum of all factors, especially considering the wide variances you can have in an impact. 750 gb I'm pretty sure, G's old ones were apparently large as well), and a huge cantilevered weight (the ARFCOM thing came from a MAWL which may be cool but is a giant thing hanging off of one side) and yeah, chances are good that some shit will contact. So pair a light and narrow MCMR/MK16/whatever with a barrel that is supposed to flex, a gas block that is unnecessarily large as it is in many cases (I love BCM but their. I think its very plausible that any light weight narrow tube of a rail may contact a gas block but in this argument, people seem to forget that the barrel flexes too. Seen lots of shit back and forth about it without more than some sketchy "proof" and testing. This was a huge deal, at least in the sense of how emotional people got over it. So maybe I put MK16 on a few uppers with no lasers and then some more heavy duty rail for the one upper with a laser (for night vision work)? It wasn’t clear if an aimpoint on the upper receiver would be drastically have POI shift from this, versus a laser on the rail. I’m wondering if I shouldn’t stick with a heavier and more durable 4-way pic rail setup for an upper I plan to run an IR laser on, since it seems like the issue is mostly related to devices attached to the rail itself. ![]() ![]() By asking here, with reasonable common sense folks. Personally I don’t put much stock in arfcom or Reddit, but it does seem very plausible a drop of the rifle could bend the rail every so slightly and cause it to press against the gas block, so internet rhetoric aside, before I buy a few more of these for different uppers I want to make sure it’s not an issue. Or they were getting d0xing/death threats from Bill geissele off their forum. Then apparently according to a Reddit summary of the issue, this was all over ARFcom 2 years ago and was wiped by moderators who, depending on your standpoint, were either trying to cover it up. ]Īllegedly, the us military or someone did drop testing and when they dropped these URGI mk16 rails, the rails bent slightly, contacting the gas block which is really close to the inside of the rail, and changing point of impact by something ridiculous like 5 To 10 MOA. So I googled around more and found a trove of internet hatred for them, and not just them, but potentially any light free float alum rail system that hugs the barrel tightly. I bought my first geissele rail, an MK16 rail this week and I liked it so much in hand, uninstalled, that I went to buy another but it was sold out from the one dealer who happened to have them 2 weeks ago in the size and color I wanted.
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