I'm at my wits end.....how do I remove the dust cover from my MS ?

Save yourself the trouble for next time and just install one of the strike industries ultimate dust covers.

Mine wasn't working. I adjusted the set screw but right before closing I noticed that the set screw would basically mar up the half circle slot really well in order to "fit"

I guess check yours to see if theres any marring. IMHO it's not worth it just to use the Strike Industries covers.
 
Cut in half, remove an inch from the inside, work back piece out, then use a punch on the barrel nut side and drive the other one out. It is a slightly undersized hole so have patience.
 
Cut in half, remove an inch from the inside, work back piece out, then use a punch on the barrel nut side and drive the other one out. It is a slightly undersized hole so have patience.

Cut it with what ? It's such a tight tolerance to the side of the receiver I can't imagine what to use to cut it without doing damage to the receiver wall.

Regardless, I'm at the point of no return now, the tension spring is mangled by trying to unwind it off the rod enough to get a grip on the rod with pliers to try tapping the rod forward....but the wire just broke and I can't get a grip on it any more to keep unwinding.....and I've dinged the receiver a couple times as the pliers slipped, cut right through the tape I used to try and avoid scratches.

Grrr
 
Cut it with what ? It's such a tight tolerance to the side of the receiver I can't imagine what to use to cut it without doing damage to the receiver wall.

Regardless, I'm at the point of no return now, the tension spring is mangled by trying to unwind it off the rod enough to get a grip on the rod with pliers to try tapping the rod forward....but the wire just broke and I can't get a grip on it any more to keep unwinding.....and I've dinged the receiver a couple times as the pliers slipped, cut right through the tape I used to try and avoid scratches.

Grrr

Man, that sucks. All I can add is to add a little heat to the pin bore most likely the back to try and get it to open up a bit, some penetrating oil, and maybe some side cutters in place of pliers to bite a bit harder onto the rod? I feel like the rod must have been pounded in all the way. It doesn’t need to go that deep into the bore, just has to clear the barrel nut. And don’t feel too bad, my receivers have gained a few scratches from assembling/disassembling. I use a sharpie to hide them a bit.
 
Man, that sucks. All I can add is to add a little heat to the pin bore most likely the back to try and get it to open up a bit, some penetrating oil, and maybe some side cutters in place of pliers to bite a bit harder onto the rod? I feel like the rod must have been pounded in all the way. It doesn’t need to go that deep into the bore, just has to clear the barrel nut. And don’t feel too bad, my receivers have gained a few scratches from assembling/disassembling. I use a sharpie to hide them a bit.

Dude ! Side cutters did the trick ! Just slid right out after a couple taps, thanks for the tip !

Feel pretty stupid, they were right there on the bench the whole time, but I tried everything but them first lol.

Oh, and I managed to find the remainder of the spring stuck into the bottom of my foot : )
 
Welp, the conclusion to this 15min job that ended up taking a good part of two days, is that the Strike Industries Ultimate Billet dust cover will only stay closed if the adjustment screw for the plunger detent is making contact with the receivers ejection port.

If I back off the adjustment screw enough that only the plunger makes contact, then it won't hold the door shut. With the adjustment screw making contact, the door will stay in the closed position, but leaves a healthy gap between the door and the ejection port, thus pretty much negating the whole purpose of a dust cover.

Another possible issue, which I haven't had a chance to test yet, is the short "arm" of the coil spring seems to sit a little higher than the V7 spring it replaced, maybe a millimetre above the ejection port cutout. Will be interesting to see if it interferes with ejected casing trajectory. Might be able to cut it back a hair, but will wait to see if it actually causes an issue.

Anyway, the rig is back together and torqued up, so I'll be living with this sub-par dust cover experience for awhile, not in the mood to throw another $80 at a problem I shouldn't have to spend this much time troubleshooting.
 
All that to install a sub-par plastic dust cover... maybe should have stayed with the original? ... or send it back to ATRS and let them deal with it if this known issue is not a problem in their opinion.
 
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All that to install a sub-par plastic dust cover... maybe should have stayed with the original? ... or sent it back to ATTS and let them deal with it if this known issue is not a problem in their opinion.

It is the billet aluminum version, seemed to get good reviews and the adjustable plunger was a selling factor, since the V7 cover i tried first wouldn't stay closed and had no adjustment feature, so no, I wasn't going to stick with an already faulty part.

Maybe I approached this the wrong way spending cash on fancy parts, I haven't tried a cheap parts bin cover yet. If this Strike Industries causes issues, I'll probably try the cheap fix first before complaining to ATRS, but it is possible the receiver is the culprit, seems like quite a few owners of Sporters have dust cover headaches.

In the grand scheme of things, I probably won't be spending much time in dust storms any time soon, so it's more an annoying quirk when you just want things to work as advertised.
 
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Nail clippers

i had a little nub sticking out near the barrel nut. ended up using some old ones ( wrecks them ) and it finally came out.
 
The MS hole for the dust cover pin is undersized, or at least my buddies was, it would not accept a standard size dust cover pin without a lot of encouragement, needless to say that thing is never coming out in one piece again, cut in several pieces... maybe.

May I ask what brand of rod you used ? Rod's tend to be 0.122-0.123", however there are a number of rods floating around that are 0.126, and I've confirmed with Aero Precision that their rod is supposed to be 0.122-0.123, but I've seen two now that were 0.126. The possibility of counterfeit parts did come up in that conversation.

I am not up on this gun, but can you give the front a good wack with a plastic dead blow hammer? may jar it ahead.

This right here is essentially what we've recommended from day one. Inertia! :agree::agree::agree:

This is a design flaw that should have been corrected. ATRS was asked about it several times and according to them it is working as intended.

I'm sorry you feel that way, however we do not see it as a design flaw.

All that to install a sub-par plastic dust cover... maybe should have stayed with the original? ... or sent it back to ATTS and let them deal with it if this known issue is not a problem in their opinion.

What makes it a sub-par plastic dust cover ? :confused: What makes you think that plastic/polymer isn't the ideal material for a dust cover? Hell, I've been trying to get the shell deflectors made out of polymer for a long time now. Had a few prototypes done up and everything. I wouldn't say there isn't an issue, if I wasn't prepared to back that up. So if you need someone to install or uninstall a dust port cover for you, feel free to contact us. Standard shop rates apply.

Nail clippers

i had a little nub sticking out near the barrel nut. ended up using some old ones ( wrecks them ) and it finally came out.

Now that is just plain clever! The additional leverage, combined with the reduced clamping surface would be ideal!
 
Use a cut off wheel on an air die grinder or dremel. Slide a piece of shimstock in between it and the receiver if you can fit it.

Only do this as an absolute last resort and proceed at your own risk! I'd rather you get a hold of us and we can extricate the rod first! The odds of damaging the receiver go up substantially!
 
May I ask what brand of rod you used ? Rod's tend to be 0.122-0.123", however there are a number of rods floating around that are 0.126, and I've confirmed with Aero Precision that their rod is supposed to be 0.122-0.123, but I've seen two now that were 0.126. The possibility of counterfeit parts did come up in that conversation.

I'm sorry you feel that way, however we do not see it as a design flaw.

But it is a design flaw. TDP for the US M16 requires a pin diameter of 0.125 with a variance of 0.002. Your channel is designed for a pin with a diameter of 0.122-0.123. AKA not in keeping with mil-spec.
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Seen here: https://ibb.co/02kmb2w

All my pins BCM, Aero, Geissele, Colt USA, measure 0.125.
 
But it is a design flaw. TDP for the US M16 requires a pin diameter of 0.125 with a variance of 0.002. Your channel is designed for a pin with a diameter of 0.122-0.123. AKA not in keeping with mil-spec.
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Seen here: https://ibb.co/02kmb2w

All my pins BCM, Aero, Geissele, Colt USA, measure 0.125.

I asked our production supervisor to offer some feedback for you:

All our upper receivers from the very first to the ones we are machining at this moment have the dust cover pin hole sized precisely to 0.1250", verified using a precision gauge pin. The very schematic you posted clearly indicates that the pins must be 0.125+0.000/-0.002", meaning the pin must be 0.123" to 0.125". If the pin is smaller or larger than this by even 0.0001", the pin does not conform to the schematic you have posted here. A unilateral diameter tolerance of -.002" should be checked with a precision micrometer and not a caliper as variance in caliper measurement are too great to trust when the part approaches either end of the tolerance in question. We would be happy to measure your pins with our Mitutoyo Quantum digital micrometer, capable of accurately resolving 0.00005" (50 millionths of an inch), calibrated with precision gauge blocks to +/- 10 millionths of an inch at 21 degrees C.

Furthermore, our product is not an AR-15, M16, or variant of any of those rifles. It is our goal to produce a receiver that fits as many parts available on the market as possible, but we have no control over the parts created by other companies, nor does our product conform to any mil-spec standard as it exceeds them in many fundamental ways.

G.F.
Production Supervisor
Alberta Tactical Rifle Supply
 
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