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Posted: 11/28/2004 3:12:07 PM EDT
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Have a 16 inch barrelled RRA w/ standard front sight tower. Want to replace with a YHM-9390A Two Piece Gas Block and folding or removable sight. Questions are: 1) How to get the existing sight off with as little damage as possible? 2) Any tricks to putting the new gas block on? 3) Is there a height difference between 16 and 20 inch sights? Looks like knock out sight base pins and gas tube pin, spread the old sight tower and slip it off, put gas tube in top half and replace pin, line up gas holes and clamp it down. |
Whoa, whoa, whoa.........................you don't have to do anything like that. Just tap it off the barrel, toward the muzzle end, of course. You can leave the gas tube installed until you remove the FSB also. |
Nah, just tap it off the barrel. There is no need for prying or spreading, as it is a slip fit and will come off with some gentle tapping. |
How do you like the YHM? Feel like it is a quality piece? How well does it lock up and down? Got any pics? I am thinking of ordering one.... the PRI is sooooo expensive. |
I start out with a large brass punch to knock them loose, then a smaller pin punch to tap them out. Warning - I had one Bushmaster that I had to beat the crap out of to get it to come loose, and I never could get them out. I had to dremel about half the pin out before it would turn loose. It happens. |
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I have a question on this subject. I have read up on this subject, and I am currently on my first AR Build, but I have not been able to find any info on how to properly zero the rifle after the FSB is replaced/removed. Is it idiot proof? as in you cant mess it up, as soon as you replace the FSB it is good to go? or does it require careful recalibration to rezero the rifle? |
If you just took off your original FSB, then replaced it back again, using the same pins, then there should be no calibration. Zero should be held, but you should verify. If you replaced with with an aftermarket clam type, then you machanically center the rear, and rotate the front replacement FSB to zero. |
I like it a lot, very solid and well built, good thick steel on the barrel bands. Positive lock up and down, no spring to "flip" it up or anything.   A look at it from the front:  |
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