AR-15 front sight

dlb435 · May 27, 2010, 08:44 AM

My front sight was pinned on a little off to one side. I've got to re-pin the thing. What size reamer do I need for the over size pins?

ogree · May 28, 2010, 04:00 AM

The size of the reamer would be determined by the size and kind of the pins you are using.
I had to do that once, welded up the original holes, aligned the front sight and then re-drilled them using the front sight base as a guide....what a pain in the a** that was cause I didn't have a fixture specifically made for performing that operation.
If possible....I would send it back to the manufacturer and have them correct it, that is less of a hassle.

dlb435 · May 28, 2010, 06:37 AM

I've ordered a size 2/0 reamer and some oversize pins. Doesn't look like it will be much of a job. The original pins were 0.125 straight pins.

LongRifles, Inc. · May 28, 2010, 01:09 PM

Here's a trick used by the USMC PWS shop and by the better NRA service rifle builders.

Don't pin it. Drill and tap the holes in the front sight assy for set screws.

Set your rear site to MZ (mechanical zero) and then adjust the front base till it times up and shoots a no wind zero right down the pipe.

Good luck.

May 27, 2010, 08:44 AM	#1
dlb435 Senior Member Join Date: January 26, 2009 Posts: 654	AR-15 front sight My front sight was pinned on a little off to one side. I've got to re-pin the thing. What size reamer do I need for the over size pins?

May 28, 2010, 01:09 PM	#4
LongRifles, Inc. Senior Member Join Date: October 21, 2009 Location: Black Hills of S. Dakota Posts: 195	Here's a trick used by the USMC PWS shop and by the better NRA service rifle builders. Don't pin it. Drill and tap the holes in the front sight assy for set screws. Set your rear site to MZ (mechanical zero) and then adjust the front base till it times up and shoots a no wind zero right down the pipe. Good luck. __________________ LongRifles, Inc. "More than a business, This is a lifestyle." www.longriflesinc.com

May 28, 2010, 04:00 AM	#2
ogree Senior Member Join Date: January 18, 2005 Location: Idaho Posts: 151	The size of the reamer would be determined by the size and kind of the pins you are using. I had to do that once, welded up the original holes, aligned the front sight and then re-drilled them using the front sight base as a guide....what a pain in the a** that was cause I didn't have a fixture specifically made for performing that operation. If possible....I would send it back to the manufacturer and have them correct it, that is less of a hassle.

May 28, 2010, 06:37 AM	#3
dlb435 Senior Member Join Date: January 26, 2009 Posts: 654	I've ordered a size 2/0 reamer and some oversize pins. Doesn't look like it will be much of a job. The original pins were 0.125 straight pins.