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Old 07-02-2019, 02:54 AM   #1
Young Gun
 
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How do I find new screws for MB4411?

This might be a dumb question, but I have an MB4411 and I've upgraded the internals with aftermarket pieces. However...the screws, particularly on the upper rail, are not holding up too well. I don't know if it's the screws or the holes, but they only screw in so much and it's left the rail terribly wobbly and I honestly don't know how to go about fixing this. I'm pretty sure the screws go in some, enough to hold the rail in place, but then they just spin freely without tightening it more. I'd just use loctite on it if I didn't need to remove them later for further upgrades and maintenance, so that's out of the question.

Last edited by The_Seeker; 07-02-2019 at 03:01 AM.
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Old 07-02-2019, 05:40 AM   #2
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You probably over tightened and stripped threads inside the receiver. Happened to me on almost all small receiver screws :( stupid brute. But on the positive side. Now’s the time to upgrade tho. Redrill hole for a bigger bolt and rethread it.
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Old 07-02-2019, 06:18 AM   #3
Young Gun
 
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Thank you for your reply!

Darn. I was being careful not to overtighten, but apparently not careful enough. So do you think I should just get slightly thicker, slightly longer screws and drill through the existing holes? I don't even know the size of these ones. I'd have to take some with me to compare to others when I'm out to buy some.
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Old 07-02-2019, 11:21 AM   #4
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No, you should get same length or measure out with caliper how long can you go before they protrude into the inside of receiver. If they do, they scrape cylinder.
As for size I don’t have the numbers by hand, but I could measure when I’ll have the time, usually they’re standard size and goes up by two, like 6mm bolt then other size is 8mm and then 10mm, of course you can get odd ones but they’re usually for specific purpose. Just out of my head guessing, stock screws are 2mm, but measure yourself. Also make sure you get same thread pitch as your rethreading tool. It’s nothing new, been done and I remember someone here talking about making bigger screws for trigger unit to hold more power
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Old 07-03-2019, 03:29 AM   #5
Young Gun
 
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Eesh. I'm not very handy, honestly. Maintenance and upgrades is mostly disassembly and reassembly and that's easy enough, but I'm worried about screwing something up just trying to get different screws in.
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Old 07-03-2019, 07:02 AM   #6
Young Gun
 
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Oh jeez. I remembered incorrectly, they don't turn freely. It's the screws that are a bit stripped. I didn't have the proper screwdriver and made due and so it's made turning the screws a bit harder as it tightens as it does not grip well. I was able to get a proper screwdriver and tighten up the screws, so now everything is locked in nice and tight.
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Old 07-03-2019, 10:42 AM   #7
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Saved yourself some trouble
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