MDI SLR receivers come loose.

I've only put just under 200 rounds through my SLR. Bolt is still tight but then again I've barely used it. Time will tell if this becomes another thing on the list of issues with mine.
 
Maybe a locking washer like a nordlock could help with this issue? They keep bolts from falling off of piledrivers etc, could work here? Anyone know off hand what size the bolt is? I have a few kicking around, when mine shows up next week maybe I’ll give it a try if I have the right size.
 
MDI should come up with a warranty fix for loosening hardware if it's the case, this is something that should have been obvious during their testing and fixed before any were shipped.

I still don't have my SLR, but have had my WK-180s for a couple weeks and am pretty disappointed with the rifle. I am keeping my test rifle and might do a competitive review between it and some other guns in my safe (that includes accuracy testing...) but for now I'm putting my extra unfired WK-180 on the exchange this weekend if anyone wants it. Hopefully the production Modern Sporter is a quality product because I'm in on that pre-order as well.
 
Uisge said:
Maybe a locking washer like a nordlock could help with this issue? They keep bolts from falling off of piledrivers etc, could work here? Anyone know off hand what size the bolt is? I have a few kicking around, when mine shows up next week maybe I’ll give it a try if I have the right size.
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Guess I missed the above posts ha: my bad. Nord-locks work great even just hand tight, can’t imagine why they wouldn’t work here.
 
Murray 3-D said:
Its a CNC people. They are all capable of machining to a 10 000th of an inch if it's written into the code.
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I hope this is a joke. Even with the best machines like what I'm used to, they don't do what you write as there are many variables. That's why we probe, calibrate multiple hardware and software items, have thermal compensation and algorithms running w macros for growth compensation, use macros for offset adjustment, or go old school and measure/adjust. you name it. And there aren't many machines, period, that can keep that kind of tolerance. Hell even a CMM isn't typically repeatable to 2 tenths. Anyone can make something *look* like the picture, about 1/1,000 "machinists" can actually make good parts themselves when actually measured.

Also blue loctite isn't a structural locking compound and is fine. It breaks open easy enough for the bolt size, and is only there to provide 100% thread engagement as most threads run 55-70% engagement to make the thread actually work. Loctite fills the voids, creating a full thread and mating both pitch diameters perfectly. Red is just a stronger bond to itself, as loctite doesn't bond to the metal.

And yes, helicoils are odd. They can pull out easy. Keenserts or similar would be better.
 
AFisher said:
I hope this is a joke. Even with the best machines like what I'm used to, they don't do what you write as there are many variables. That's why we probe, calibrate multiple hardware and software items, have thermal compensation and algorithms running w macros for growth compensation, use macros for offset adjustment, or go old school and measure/adjust. you name it. And there aren't many machines, period, that can keep that kind of tolerance. Hell even a CMM isn't typically repeatable to 2 tenths. Anyone can make something *look* like the picture, about 1/1,000 "machinists" can actually make good parts themselves when actually measured.

Also blue loctite isn't a structural locking compound and is fine. It breaks open easy enough for the bolt size, and is only there to provide 100% thread engagement as most threads run 55-70% engagement to make the thread actually work. Loctite fills the voids, creating a full thread and mating both pitch diameters perfectly. Red is just a stronger bond to itself, as loctite doesn't bond to the metal.

And yes, helicoils are odd. They can pull out easy. Keenserts or similar would be better.
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Most CNCs have a resolution of 1/10000th of an inch... and let's face it, how many sections on a reciever need to have a tolerance of less than a thou ??? Yah probably none. nuff said. High quality CNC'ing my ass, it's really just plain old regular CNC work, and a generous mark up.
 
Murray 3-D said:
Most CNCs have a resolution of 1/10000th of an inch... and let's face it, how many sections on a reciever need to have a tolerance of less than a thou ??? Yah probably none. nuff said. High quality CNC'ing my ass, it's really just plain old regular CNC work, and a generous mark up.
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It doesn't matter what the resolution on the controller is, it could show microns and not be able to repeat a thou. I'm just spreading some knowledge on the topic since its my wheelhouse.

And yes, the true position is what matters w those holes. .005" T-P is normal. I wonder if the holes are also undersize for some.
 
Murray 3-D said:
Most CNCs have a resolution of 1/10000th of an inch... and let's face it, how many sections on a reciever need to have a tolerance of less than a thou ??? Yah probably none. nuff said. High quality CNC'ing my ass, it's really just plain old regular CNC work, and a generous mark up.
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You have no idea how anything works.

It is better to remain silent and thought a fool, than to open your mouth and remove all doubt.
 
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