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Trouble with installing bullet guide

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I am installing a bullet guide but I am having trouble. I drilled my hole and I am trying to tap it but it seems like the tap doesnt seem to want to start. It feels like it is starting to cut the threads but then stops. I was at it for 30min with no luck. Any idea what I am doing wrong?

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When the die starts to cut, it will feel like it stops. That is your indication that you need to back off a quarter turn or so until you here a "click". That is the tap clearing metal from the cutting threads. When you get to the stopping point, back off until you hear the click and then slowly keep threading. You will repeat this process several times until until the tap will thread in and out smoothly. Take it slow and good luck.

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When the die starts to cut, it will feel like it stops. That is your indication that you need to back off a quarter turn or so until you here a "click". That is the tap clearing metal from the cutting threads. When you get to the stopping point, back off until you hear the click and then slowly keep threading. You will repeat this process several times until until the tap will thread in and out smoothly. Take it slow and good luck.

...and use some oil.

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I don't mean the tap stops just the feeling of it cutting. Could have I have screwed up drilling the hole or just not using the tap correctly?

 

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Are you using the tap and drill bit that came with the BG in a kit, or are you using a tap and drill bit that you had lying around? What size hole did you drill before tapping. If you did not drill straight in and strait out i.e. the drill bits changed angles a little, the hole drilled could be slightly large for the threads to be cut. On last question...when you drilled the hole for the BG did the bit punch through to the opening below the trunion. If you did not feel it " punch" through, you tap is bottoming out in the hole you drilled and that is why it stops cutting.

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I am using the kit from dinzag so I am assuming that the drill bit and tap are the right sizes.I am pretty sure that I went all the way through the trunion because the drill bit goes deeper than the tap. Is there a way to check if I messed up drilling the hole?

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I tried again today to tap the hole with no luck. I am going to try getting another tap and using proper lube instead of wd-40. If this doesnt work then I am thing of securing the guide in with jb weld. I know it isnt ideal but I havent heard of it failing anyone.

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I was in the same situation you are in right now, only I attempted to tap it by hand. (4) 6-32 and (2) 8x32 taps later, I went to the very next drill bit larger then what's required for the 8x32, drilled it out smooth, found a slightly longer button top 6-32 bolt (hex key'd), then I secured the screw with a lock washer, and permanent lock tight.

 

I know there have been some folks talking about using JB Weld to attach the bg to the trunion. I would highly advise against that, simply if you do a lot of rapid fire, it's theoretically possible to get the chamber and front trunion warm enough to weaken the epoxy.

 

Take your time, follow the instructions the other folks posted above (lots of oil and compressed air) and remember to back your tap out when you feel it binding. If you get nervous, back it all the way out, clean the oriface and the tap of all metal chips and dive back in. But once again, while it is possible to tap it with a drill, 6-32, and even 8-32 are too small to handle substained torque and they will shatter.

 

If they shatter, you have a couple of options: Drill it out - Considering that the taps are usually harder (but more brittal) than the drill bits, good luck; Use a broken bolt extracter - Once again, this requires a good drill bit for a pilot hole, for the extracter to penetrate and get engaged, take it to a machine shop and have them use a process of EDM - the basically disintegrate the tap using plasma (could be kind of pricey), or get a good center punch and wail away on it a hammer, which was what I did. Just make sure everything is supported and secured before you start smacking anything.

 

To reiterate, I would recommend that you hand tap, use lots of oil, back the tap out a turn or two or all the way out, if you want to clean the threads and tap with compressed air and go slow.

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Well I bought the new tap and that did the trick. I must of got a bad one in the kit from danzig because this one worked with very little effort to start. I am glad I did this the right way instead of my plan B.

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Congratulations on your success, probably need to touch up that mag latch with a file to get those mil sup mags to latch in right. It will not take much.

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