BayouBob Posted February 3, 2013 Report Share Posted February 3, 2013 I agree with 98Z and the other guys about the gas block. Something isn't right about it. I put a PRI adjustable gas block on my CMMG 308 and cured all the problems the factory couldn't figure out. If you do replace the block go with an adjustable model; it only costs a few dollars more and you can tailor it to your rifle. Quote Link to comment Share on other sites More sharing options...
Powerman Posted February 3, 2013 Author Report Share Posted February 3, 2013 The build was bad enough... sort of hard to spend more money... just to be sure...I figure the oil will seep. It's what it does. Like if it wasn't there, then the block would just be sealed... but a film of oil will flow.I had planned to go shoot again next Friday. I guess the worst I could take it off, clean it up, check it out and try it again. If that does not work I can replace it. I'm not trying to argue the point.. I don't know. You guys do. Just trying to make sure.Is it true most rifles are over gassed? (obviously mine is under, maybe) I originally was going to get a JP adjustable, but then did not go with the low mass carrier and figured I did not need it. Quote Link to comment Share on other sites More sharing options...
Rsquared Posted February 3, 2013 Report Share Posted February 3, 2013 Not sayin that you're trying to argue the point my man. It's just that you shouldn't have any seepage coming out of the block like you're seeing. Just swap it out, and your problems are more than likely gonna go away. After all, what's the price of a gas block to make a rifle run properly? If it ain't reliable.....it ain't worth it. Quote Link to comment Share on other sites More sharing options...
seasprite Posted February 3, 2013 Report Share Posted February 3, 2013 My rifle was overgased darned near ripped the case heads off from the early extraction it was having. I put the Pri adjustable gas block on mine and it stopped all the problems from overgasing that I was having. In your case I wouldn't get to worked up over it a standard block should do unless you plan on putting a suppressor on it or want to slow the bolt down for little less recoil. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 3, 2013 Report Share Posted February 3, 2013 I figure the oil will seep. It's what it does. Like if it wasn't there, then the block would just be sealed... but a film of oil will flow.Doesn't work that way, buddy. What you're seeing from the front of that gas block - you shouldn't be seeing. Wouldn't matter if you submerged the thing in oil. That carbon and poop shouldn't be coming out of the front of the gas block. Quote Link to comment Share on other sites More sharing options...
Powerman Posted February 3, 2013 Author Report Share Posted February 3, 2013 OK, the DPMS was cheap. I guess I'll get another one. Looking at PRI... why do they send a regular tube with their blocks?So does "low profile" mean the FF tube will go over it? I wanted a rail to put back up sights on, but Just in the short time of having this... well it is no CQ carbine, that's for sure. :) Quote Link to comment Share on other sites More sharing options...
Powerman Posted February 3, 2013 Author Report Share Posted February 3, 2013 Not sayin that you're trying to argue the point my man. It's just that you shouldn't have any seepage coming out of the block like you're seeing. Just swap it out, and your problems are more than likely gonna go away. After all, what's the price of a gas block to make a rifle run properly? If it ain't reliable.....it ain't worth it.Just making sure... it's silly to ask for help then argue it. ;DGood point.... like I need good points to spend money. <lmao>I sure do appreciate all the help guys! Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 3, 2013 Report Share Posted February 3, 2013 OK, the DPMS was cheap. I guess I'll get another one. Looking at PRI... why do they send a regular tube with their blocks?So does "low profile" mean the FF tube will go over it? Yes, a lo-pro will fit under a rail - but that doesn't mean you have to cover it. It can sit outside the rail. PRI also does railed gas blocks, and gas blocks with flip-up front sights on them. What I linked previously (the PRI page) was all AR-15 stuff. If you buy one of those appropriately-sized lo-pro blocks, it'll go right on your rifle. If you want a railed gas block or one with flip-up sights, make sure you get into the 308 AR page on the PRI website...http://www.precisionreflex.com/Products.aspx?CAT=4822 Quote Link to comment Share on other sites More sharing options...
Rsquared Posted February 3, 2013 Report Share Posted February 3, 2013 What I linked previously (the PRI page) was all AR-15 stuff. If you buy one of those appropriately-sized lo-pro blocks, it'll go right on your rifle. If you want a railed gas block or one with flip-up sights, make sure you get into the 308 AR page on the PRI website...http://www.precisionreflex.com/Products.aspx?CAT=4822It's ok to take advice from that guy. I think he knows what he's talking about. <lmao>Just sayin! Quote Link to comment Share on other sites More sharing options...
Powerman Posted February 3, 2013 Author Report Share Posted February 3, 2013 @98Z5V.... ya, it won't be in the way with my DPMS tube, I just want to be able to take it off if need be. Or can you still take them off any block?What about sights... if I do get sights, does it have to be the same plane as the receiver... meaning not low pro? I'm not getting sights right now. No need really, and I still need to buy a scope. I just don't want to buy a block and then not be able to if I want to. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 3, 2013 Report Share Posted February 3, 2013 @98Z5V.... ya, it won't be in the way with my DPMS tube, I just want to be able to take it off if need be. Or can you still take them off any block?You'll be able to remove the tube, and it'll go right over a lo-pro block. Gas tube stays in place, too. If you're only taking off the tube itself. All that stuff comes off if you're removing the barrel nut. What about sights... if I do get sights, does it have to be the same plane as the receiver... meaning not low pro? I'm not getting sights right now. No need really, and I still need to buy a scope. I just don't want to buy a block and then not be able to if I want to.Front & rear sights will need to be same plane - they won't work if not. You won't be able to zero them. Since you're not getting back up sights right now, don't worry about it - save it for later.Get a fore end that has a rail on top (if you don't want a quad-rail). Run the front sight on the end of the top rail. That can be a plan for later, and it's easy. Basically - use a lo-pro gasblock, and don't worry about finding a gas block that you can mount a front sight on. Toss a MagPul flip-up on the end of your rail/fore end, down the road. Quote Link to comment Share on other sites More sharing options...
Powerman Posted February 3, 2013 Author Report Share Posted February 3, 2013 ^^^ OK, well i got the block I have now for that, but it isn't the same plane. I'm no AR expert, but that didn't seem right. Ya, I might change fore ends. I really just wanted a smooth tube, so it's good for now. I have thought perhaps I would build another upper some day for a CQ carbine. Have a long range upper, or swap it out for short range. For now I think I will just pull the trigger on a PRI block and call it good. Doubt I will have it by Friday, but I will give it a try. Quote Link to comment Share on other sites More sharing options...
edgecrusher Posted February 3, 2013 Report Share Posted February 3, 2013 PRI is super nice quality, I spent a lot of dough with their stuff building a rifle, you won't be disappointed. Just to re-iterate, there should be no oil seepage at any point at the gas block. Did you get the adjustable? Quote Link to comment Share on other sites More sharing options...
tackleberry2000 Posted February 3, 2013 Report Share Posted February 3, 2013 First off the bolt carrier assy is to dry. Second since its a new rifle I would contact the manuf and let them know what is going on. I have never had gas come out around my gas blocks like that. They will get you straight. Might need a new gas block. I'd contact the company and go from there. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 3, 2013 Report Share Posted February 3, 2013 Tackleberry, this is a build. There's no warranty on that. Quote Link to comment Share on other sites More sharing options...
BayouBob Posted February 3, 2013 Report Share Posted February 3, 2013 If you look around I think you can find a front sight that is designed to sit on a low profile gas block and be in line with a standard height rear sight. Quote Link to comment Share on other sites More sharing options...
unforgiven Posted February 3, 2013 Report Share Posted February 3, 2013 <munch> Quote Link to comment Share on other sites More sharing options...
Powerman Posted February 3, 2013 Author Report Share Posted February 3, 2013 I'm going to try and get it cleaned up today. See if I can get the block off and see what is going on. More than likely I will get a new gas block to rule it out. I am borrowing some scopes from a friend... something weird that both were out of adjustment and I still could not get them up. But the point is, I got to shoot it, and there is no reason wasting good ammo when I'm not even sighting anything in..... specially since it is so expensive and there is none available. I'll update with what I find.But I do have some scope questions if anyone wants to follow me over.... ;D Quote Link to comment Share on other sites More sharing options...
Powerman Posted February 4, 2013 Author Report Share Posted February 4, 2013 The block was still tight, but I put a bit of heat to it and it came right off. There isn't anything obviously wrong. Nothing plugged. But you can see the powder fouling on the barrel and block by the port. Is that normal looking or no?[img width=810 height=456]http://i48.photobucket.com/albums/f217/free2801/IMAG0063_zpsce3a80fa.jpgthe rest of it looked fine. No obvious gas escaping else where. I used some P-oil so can't say how much oil was or wasn't there before. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 4, 2013 Report Share Posted February 4, 2013 That's not normal, man - that block was not sealing at the gas port. That's a pretty big carbon ring around that gas port, and on the inside of the gas block. Something with the machining... Quote Link to comment Share on other sites More sharing options...
imschur Posted February 4, 2013 Report Share Posted February 4, 2013 I wonder if it's not round. The diameter of the carbon ring is certainly beyond the edge of the block. StrangeI wonder if the block was squeezed too hard in a vise somewhere along the line Quote Link to comment Share on other sites More sharing options...
DNP Posted February 4, 2013 Report Share Posted February 4, 2013 I wonder if gas is getting into the tube. It looks like it was centered enough. If somehow that tube is blocked or not letting enough gas in wouldn't it find the next best exit?I say that because it looks like its going everywhere but down the tube Quote Link to comment Share on other sites More sharing options...
Powerman Posted February 4, 2013 Author Report Share Posted February 4, 2013 ^^^ Could not say for certain, because the rifle did cycle when lubed. And I checked the tube and ports and it seems clear. And for the block moving, I could not tell any damage to the tube. I don't know. At leas the markings on the barrel where it was on did not have any weird pattern and it looked the same all the way around.I'm not going to bother though, I will order a low pro PRI block tonight.Do any of you see any great need to get an adjustable one? Quote Link to comment Share on other sites More sharing options...
DNP Posted February 4, 2013 Report Share Posted February 4, 2013 They have to be on it with that thing being out of round. It's the only thing that makes sense. Way too much gas is going where it shouldn't and that's the only logical explanation. How or why it's out of round, who knows? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 4, 2013 Report Share Posted February 4, 2013 Do any of you see any great need to get an adjustable one?Personal call.Are you going to add a suppressor, in the future? Or, are you going to use the rifle in any 3-gun type competitions? If the answer to both of those is no, then just simplify everything, and run a non-adjustable block. Less parts. Less things to worry about.There are several things you can do with the rifle, down the road, to manipulate felt recoil - besides having the ability to adjust gas. Add weight to the recoil system in a couple different ways will do it.So, no suppressor, no 3-gun competitions - just run a standard, non-adjustable block. Quote Link to comment Share on other sites More sharing options...
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