Matt60 Posted January 25, 2017 Report Posted January 25, 2017 Hi all new here to the forum and after a lot of searching I decided to join to try and get some info. So my current build consists of a Fulton Armory upper (DPMS low profile) and lower reciever, magpul PRS, Geiselle 2 stage trigger, Fulton Armory bcg, and Criterion 20" .308 barrel from Fulton .875 . Below is a diagram of the Superlative Arms gas block I have right now and am having trouble finding a handgaurd to clear it. I just returned a handguard with an ID of 1.5 and it was a very tight fit with no room for barrel whip. I would prefer to keep the gas block but if i have to i will switch to an SLR adjustable. So does anyone have suggestions for a handguards larger than 1.5 ID? Or has anyone ran this gas block with any success?
Toolndie7 Posted January 25, 2017 Report Posted January 25, 2017 (edited) Matt a troy alpha will fit no problem. Here are the dimensions i got from mine when i machined my own gas block. Most dimension you see are the diameter and dont account for the bump needed for the gas tube. Edited January 25, 2017 by Toolndie7
Matt60 Posted January 25, 2017 Author Report Posted January 25, 2017 Is that enough space to keep the gas block from hitting the handguard when fired?
98Z5V Posted January 25, 2017 Report Posted January 25, 2017 I don't think the gasblock is gonna move when fired - if it's not hitting your handguard when installed, it's not gonna hit when fired...
Matt60 Posted January 25, 2017 Author Report Posted January 25, 2017 13 minutes ago, 98Z5V said: I don't think the gasblock is gonna move when fired - if it's not hitting your handguard when installed, it's not gonna hit when fired... Well the reason I ask I have seen the videos in slow motion of people shooting and the barrel is moving quit a lot. Of course I don't know what size barrel they are using. But after looking around some more I stumbled apon this and I think I may try it out because it is much smaller. Anyone used this JP block? https://www.jprifles.com/buy.php?item=JPGS-10D
Matt.Cross Posted January 25, 2017 Report Posted January 25, 2017 The whole gun is moving quite a lot,not just the barrel. It won't be an issue.
planeflyer21 Posted January 25, 2017 Report Posted January 25, 2017 The all-time supreme master of barrel "whip" are the early spaghetti-barreled Ruger Mini-14s: thin barrel, moving mass 1/3 the weight of the barrel. You won't have an issue with any AR based rifle.
Matt60 Posted January 25, 2017 Author Report Posted January 25, 2017 What do yall think about the JP gas block?
Matt.Cross Posted January 25, 2017 Report Posted January 25, 2017 Haven't run a JP gas block yet, but they generally enjoy a good product reputation. I'd buy one.
Rsquared Posted January 26, 2017 Report Posted January 26, 2017 I don't have that particular model. But I run two other JP blocks on a couple of my AR-10's. An A2 FSB type, and a lo-pro compact style (I think they've discontinued that particular model since). I've never had a problem with them. They do their job.
Matt60 Posted February 16, 2017 Author Report Posted February 16, 2017 So I ended up going with the JP gas block with a JP handgaurd and I couldn't be happier. I can't say enough good things about JP quality...even their packaging.
Armed Eye Doc Posted February 16, 2017 Report Posted February 16, 2017 (edited) 10 minutes ago, Matt60 said: So I ended up going with the JP gas block with a JP handgaurd and I couldn't be happier. I can't say enough good things about JP quality...even their packaging. It's great that you found what you were looking for and it worked out well. The only thing left for you to do is to take pictures and show the completed project. Edited February 16, 2017 by Armed Eye Doc
Matt60 Posted February 16, 2017 Author Report Posted February 16, 2017 After I got it together and lubed the bcg I worked the action a few times and it felt kind of rough but every functioned properly. I just had it cerakoted...do yall think theveryone cerakote just needs to break in a bit?
Armed Eye Doc Posted February 16, 2017 Report Posted February 16, 2017 I'll be the first one to tell you that it needs to be dripping with lube during the break in period. These need a lot of lubrication at the beginning.
98Z5V Posted February 16, 2017 Report Posted February 16, 2017 3 hours ago, Matt60 said: ...do yall think theveryone cerakote just needs to break in a bit? Cerakote goes on at 5/10,000" thick. Cerakote doesn't need to break in. The rest of the rifle does, but the Cerakote isn't gonna hold it up.
Matt60 Posted February 16, 2017 Author Report Posted February 16, 2017 What do yall like to use for lube? My local shop said they just use lithium grease.
shepp Posted February 17, 2017 Report Posted February 17, 2017 3 hours ago, Matt60 said: What do yall like to use for lube? My local shop said they just use lithium grease. A lot of us use mobile one synthetic like doc said wet!
98Z5V Posted February 17, 2017 Report Posted February 17, 2017 (edited) 6 hours ago, Matt60 said: My local shop said they just use lithium grease. That's NOT a good idea. Works for the Mk19 Grenade Machine Gun, but that's not the choice for the Big AR. No matter what the local shop said. Edited February 17, 2017 by 98Z5V
shepp Posted February 17, 2017 Report Posted February 17, 2017 (edited) 8 minutes ago, 98Z5V said: That's NOT a good idea. Works for the Mk19 Grenade Machine Gun, but that's not the choice for the Big AR. No matter what the local shop said. Off topic but on topic. The ar45 upper came today they used white lithium grease, I would assume for storage, should I degrease and wait for a bottle for uncle toms super lube? i mean .45 acp is like lobbing a grenade but........ Edited February 17, 2017 by shepp
98Z5V Posted February 17, 2017 Report Posted February 17, 2017 1 minute ago, shepp said: Off topic but on topic. The ar45 upper came today they used white lithium grease, I would assume for storage, should I degrease and wait for a bottle for uncle toms super lube? Degrease it, and you can run M-Pro 7 in the meantime, and I'll get you hooked up with The Lube... I'll get you some pics of where the carrier wears the most - get the lube there, for sure.
Matt60 Posted February 17, 2017 Author Report Posted February 17, 2017 Are yall for real on the mobile 1?
EngrBob Posted February 17, 2017 Report Posted February 17, 2017 Yep, I use it on all of mine, works beautifully.
beantown Posted February 18, 2017 Report Posted February 18, 2017 (edited) 21 hours ago, Matt60 said: Are yall for real on the mobile 1? Yes! Edited February 18, 2017 by beantown
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