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Posted: 10/29/2011 12:07:40 PM EDT
| I put my rifle together last night (as soon as my wife wakes up and tells me where the camera cable is - I'll upload some pictures) using a Mega Machine Lower, with the tension screw in the receiver. Has anyone here used it to success? If you screw it in from the interior I guess you need blue locktite to secure it- or maybe not, it won't back out into the receiver with the upper closed. Anyone else use this tension screw with positive results? |
| If you remove the grip, are you sure you don't have a hole there that the screw is adjusted from? I don't know on the Mega, but most are bored thru the receiver so you can make those adjustments easier. And yes, use loc tite. Otherwise you're gonna end up with a loose screw running around your lower. |
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Quoted: If you remove the grip, are you sure you don't have a hole there that the screw is adjusted from? I don't know on the Mega, but most are bored thry the receiver so you can make those adjustments easier. And yes, use loc tite. Otherwise you're gonna end up with a loose screw running around your lower. The magpul grip has a hole that can access the tension screw, but would be a PITA to do so. I'll give it a try-thanks. |
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I've got one of the new Mega lowers, but I haven't built anything with it yet. I did mess with the screw, and it seems to be a very tight tolerance, so locktite might not be needed.
[Edit] Also, I'm so oblivious to the AR wobble that I'll probably be surprised when I do build it. 
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The tensioner screw does take out the play between your upper and lower. We find that when paired with a Mega upper, the Mega lowers already have a tight fit.
Once you have the lower and upper pinned together using the take down and pivot pins, tighten the tensioner screw down using some blue Loctite. Once hand tight, replace your pistol grip and your are GTG. 
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Quoted:
The tensioner screw does take out the play between your upper and lower. We find that when paired with a Mega upper, the Mega lowers already have a tight fit. Once you have the lower and upper pinned together using the take down and pivot pins, tighten the tensioner screw down using some blue Loctite. Once hand tight, replace your pistol grip and your are GTG. When the lowers ship is the tension screw already installed or in a separate bag? |
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I have a Mega lower on my AR and it does screw in from the bottom, and didn't use mine because the upper and lower were already tight enough.  mine may not have shipped with the tension screw. would you be willing to part with it? 
Verified with the FFL about the missing screw. Called Rainer Arms, they shipped one out to me. Rainier Arms is another fine example of an incredible company with impeccable customer service. In fact I just blew another $126 on these guys. I should just hand them over my debit card and have them systematically run down my "wish list" 
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I have a Mega lower on my AR and it does screw in from the bottom, and didn't use mine because the upper and lower were already tight enough. mine may not have shipped with the tension screw. would you be willing to part with it? Did you try calling mega ? They may USPS you out a screw. |
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The tensioner screw does take out the play between your upper and lower. We find that when paired with a Mega upper, the Mega lowers already have a tight fit. Once you have the lower and upper pinned together using the take down and pivot pins, tighten the tensioner screw down using some blue Loctite. Once hand tight, replace your pistol grip and your are GTG. When the lowers ship is the tension screw already installed or in a separate bag? mine was in a separate bag when I bought the stripped lower. |
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If you remove the grip, are you sure you don't have a hole there that the screw is adjusted from? I don't know on the Mega, but most are bored thru the receiver so you can make those adjustments easier. And yes, use loc tite. Otherwise you're gonna end up with a loose screw running around your lower. Now I might be wrong here... It happens all the time... And I've not yet inspected a Mega lower, so perhaps it works differently than the tension screw lowers I have seen, but... The tensioning screw comes in through the bottom of the receiver. When it is tightened, it extends upwards. Loose brings it down. When sufficiently tightened, it presses onto the bottom of the upper receiver rear takedown pin protrusion... So... With the rifle together, the tensioning screw cannot self tighten beyond proper tension. And if it were to loosen, it would either eventually be stopped by the grip, or fall into/out of the grip, depending on grip design... But I might be wrong. That's how a different lower I handled worked. |
| You are correct. My point of the loctite was to both ensure the settings you made stay and the more you run the screw into the lower, the amount of threads in the hole decrease. As I have never handeled a Mega product, I don't know long the screw provided is. I like the idea of a tensioning screw, in fact the Black Rain recievers I bought have them. And I'll still loctite them in once set. |
| I have built 2 different rifles with Mega. Both had a Mega Billet Lower. One had the Gen 1 Mono Upper and one with the Gen 2 Mono Upper. I have also seen a build with a mega lower and regular mega upper (non mono). Like said above you should not need to adjust it if you are using a mega lower and mega upper. The 3 I have experience with did not need it ajusted because the fit was already perfect. |
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If you remove the grip, are you sure you don't have a hole there that the screw is adjusted from? I don't know on the Mega, but most are bored thry the receiver so you can make those adjustments easier. And yes, use loc tite. Otherwise you're gonna end up with a loose screw running around your lower. The magpul grip has a hole that can access the tension screw, but would be a PITA to do so. I'll give it a try-thanks. I always wondered why they put an extra hole in there. Thanks for that. |
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My Mega lower didnt come with a set screw, or a tapped hole for one...
I paired it with an LMT upper and the amount of play between the two is crazy, its as if each part is machined at each end of the allowed specs causing ALOT of play between the two. So much play that i have been thinking about trying a different lower. I want a tight fitting pair. Anyone know what the tolerances are for the lugs on an upper, and the I.D. of a lower? |
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If you remove the grip, are you sure you don't have a hole there that the screw is adjusted from? I don't know on the Mega, but most are bored thry the receiver so you can make those adjustments easier. And yes, use loc tite. Otherwise you're gonna end up with a loose screw running around your lower. The magpul grip has a hole that can access the tension screw, but would be a PITA to do so. I'll give it a try-thanks. I always wondered why they put an extra hole in there. Thanks for that. Same here. I just built a lower with the MOE grip, and it had 2 holes, and I was wondering what the heck that second one was for! |
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