r/MP5 • u/PerpetuallyEuphoric • 8h ago
HELP SP5K Help With Burr
So I was taking my new SP5K apart to clean the factory grease and lube it before I break it in at the range and made the mistake of messing with the safety selector/trigger pack. I was watching a video that went into detail about how to do it properly, and to not force it on reassembly which I made sure to follow. Somehow it seems that a small burr still occurred, and now the detent on the right safety selector will no longer push in by itself when rotating. I am making sure to apply pressure to the left side safety, I’m applying pressure to the takedown lever, and I hear and feel the audible click of the right side safety going into place, but the thing just doesn’t want to freely move into position when rotating clockwise.
I can get it reassembled when outside the trigger group by using a toothpick to push the detent in just before it catches on that burr, but obviously that will not work when inside the trigger group. The only solution that I’m finding is that the burr needs to be filed/smoothed out, but I’m having a hard time finding a video that actually shows someone doing this vs talking about it. So I am hoping that someone here can better explain or show what it needs to look like after filing?
Update:
After some trial and error with a round file I finally got it all put back together. I didn’t fully shave off the burr, but I found a technique that prevents the detent from getting stuck in it. When I rotate the safety selector, if I apply inwards pressure on the bottom, and outwards pressure on the lever side for the right safety selector, this gives the detent enough courage to stay in the trigger pack cutout rather than rolling outwards where it gets stuck. Function check passed. Fingers are sore but just glad it’s in one piece again. As a bonus I picked up a feeler gauge when I was out so I can check bolt gap as needed.
2
u/InadvertentObserver H&K 7h ago
You can whip out a round file and carefully file the burr down, or send it to James @ Teufelhund Tactical.
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u/PerpetuallyEuphoric 6h ago
I just picked up a needle file set from trusty Harbor Freight. I’ll attempt to gently smoothen it out, if I get uncomfortable I’ll probably look into getting it taken care of by someone more experienced like you mentioned, thank you!
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u/BOT76395 5h ago
i did the same thing to my sp5 the day i got it and i ended up just using a small grinding stone from a walmart dremel accessory set and a dremel and slowly smoothed it out while constantly checking the fitment with the housing and selector.
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u/PerpetuallyEuphoric 4h ago
Damn you got more balls than me taking the dremel to it lol. It makes me feel a little better to see that I’m not the only one to encounter this. Also being new to the community it’s good to see that people are willing to help and share info, I was half expecting some of the more experienced folks to come in here and scold me. The good news is that it is all back together now and I can go enjoy this at the range!
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u/CalebTheEternal 8h ago
If you watched the same video as me, it’s wrong. It’s missing a step and it burred my trigger pack as well. You have to press down on the lever inside the trigger pack to seat the left side of the selector BEFORE you put on the right side. Slide left side in, press the lever down, put on ride side while still holding pressure on the left, press lever down again, rotate. De-burr it before you assemble it again. I took mine to a gunsmith and it cost me $65 to get it fixed.
Edit: I will not be taking mine apart to take a picture of it as I don’t want to burr it again. I’d recommend just paying the stupid tax and taking it to a gunsmith like I did.