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Posted: 7/17/2005 8:03:10 AM EDT
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A couple of newbie "gunsmith" questions" (1) When removing the gas tube roll pin, do I need to give it a really hard whack with the punch to get it moving, or should I gently tap it out? My gentle tapping so far has just flattened the edge of the pin... (2) When removing the taper pins on the FSB (this is a Bushmaster upper) should I really whack the pins to get them moving? How much force is required to loosen the taper pins, in your experience? I do know that I should be hitting the small side of the pins. (3) Is it worth buying a FSB bench block (like the one from Brownells)? Thanks! |
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1. I just gently tap out the gas tube roll pin with a 1/16" flat pin punch. 2. Use a 3/32" nail set and a 16-ounce hammer. The key is to fully support the FSB with something that won't absorb the force of the hammer blows. You should be able to loosen the taper pins with a couple of good strikes each, them tap them out with a 3/32" flat pin punch. Soak them in Kroil first if you are concerned about them being tight. 3. I have the exact same block, but haven't had the opportunity to try it out yet. |
Most of the time, they pop out really easy... sometimes, they need a little whack to break the crud and get them moving.
Many times, especially on bushies, it takes a LOT of force to get them moving.
I think so. I dont own one yet... I use block of wood, but for the money, that looks like a great tool. I am popping these on and off all the time. |
Yep, as long as you punch them out and don't have to drill them out. In fact, you really want to reuse your pins because they're matched to the FSB and the cutouts in the barrel. |
| I cut a V notch length wise in a 4" piece of 2x4 and drilled two holes in it that are spaced apart to let the tapered FSB pins clear the 2x4 when I hammered them out. I used a slightly undersized punch with the punch end ground down to about 1/2" to get the tapered pins started out of the FSB. I made sure the punch was centered on the small side of the tapered pins and with one hard swing of the hammer (24 oz) moved the pins. I then used a longer punch to get the pins the rst of the way out...they fall into the holes I drilled in the 2x4. Never had a mushroomed pin head or any other problems. The key is to use a stable platform to rest the barrel and the FSB on and use a stout punch with and accurate and heavy hammer blow. Just remember when you install the FSB the big head of the pin is the one you want to hit. Just flip the barrel and FSB over and incert the small end of the pin in first. Tap it in with the stout punch until both ends stick out evenly or until you think the are in tight enough. There is no better way than learn by doing. |
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