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Posted: 9/2/2004 2:25:08 PM EDT
i got an amd type gas piston for my feg sa85m ak clone. when i take the carrier and gas piston out to eye ball both pistons i see that the pin holding the piston to the carrier will have to go through the new piston. the problem is there is no hole in the tapco piston for the pin to go through. what is going on? can anyone post pics to help me out? thanks
Link Posted: 9/2/2004 2:53:11 PM EDT
[Last Edit: 9/2/2004 2:54:17 PM EDT by thinice]
You have to drill a hole thru the New piston. Have fun, Just broke 1 drillbit today doing the same thing, Tapco Piston is Stainless. Go slow! Thread new piston in all the way and then back out 1/3 rd turn then drill
Link Posted: 9/2/2004 3:49:33 PM EDT
are there any pistons that are true drop in parts? why do they leave out info like that when they sell their products?
Link Posted: 9/2/2004 4:04:04 PM EDT
It's not hard to drill stainless. The trick is to use a cutting lube and go SLOW with pressure. If they came already drilled, I am not sure that they could guarantee them lining up right with your bolt carrier.
Link Posted: 9/2/2004 4:07:19 PM EDT
One word of advice, some S.S. will work harden and if you go fast, then stop, you may never drill through once you start again. The words written previously are wise, lot's of lube, go slow, and go steady 'till through.
Link Posted: 9/2/2004 4:22:51 PM EDT
i don't have a drill press. is this something i could do with a hand drill?what kind of lube are you talking about? sorry for the dumb ? i am new to working on anything.
Link Posted: 9/2/2004 5:31:52 PM EDT
I wouldn't attempt without a press, round metal that can roll + moving sharp things = afternoon filling out insurance forms

I think the lube they are referancing is oil, I've cut metal with a saw-z-all just using plain engine oil.
Link Posted: 9/3/2004 4:36:35 AM EDT

Originally Posted By occaar:
are there any pistons that are true drop in parts? why do they leave out info like that when they sell their products?

That is impossible.
Every carrier is different, the only way around it is to leave the piston undrilled, then drill it when it is indexed properly in your particular carrier.
Link Posted: 9/3/2004 5:53:22 AM EDT
The lube I was referring to was, specifically, Anchor Lube. It is the lube that we use at work when drilling stainless. It comes in a bottle and is kind of greenish colored, lots thicker than oil. Otherwise I would probably use Tap Magic.
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