View Full Version : AR-15 Modding Questions

May 13, 2010, 04:45 PM
I got a Smith & Wesson M&P15 with an A2 style front sight post. I want to remove the front sight post and replace it with a MRF (modular rail front). What I am unfamiliar with is with parts I need to buy to change out, or more aptly to have it changed out.

I would also appreciate your suggestions on parts, as I am unfamiliar with a lot of the companies and their parts.

I would like, in essence, is at least a top rail and a bottom rail on the MRF at the minimum.

Thank you in advance.:)

May 13, 2010, 04:52 PM

May 13, 2010, 07:54 PM
Is this what you're looking for? http://www.brownells.com/.aspx/pid=21445/Product/AR_15_M16_GAS_BLOCK

May 13, 2010, 07:57 PM
I've been looking through flights' links and am still on the brownells's site. I have booked marked that page that you posted as it seems to be the best option I have come across so far.

May 13, 2010, 08:00 PM
There are other makers out there- but I have used Yankee Hill products before and haven't been let down yet. They don't seem to be over priced or cheaply made- and they're not all gimmicky. You seem to pay for the product instead of the name brand on their stuff.

May 13, 2010, 09:24 PM
I've pretty much settled on http://yankeehillmachine.com/store/product413.html. It fits into my price range.

Thank you for turning my attention to Yankee Hill Machine. :)

May 15, 2010, 05:47 PM
I have been meaning to slap one of these on to my Colt AR-15A3 so I can put a low profile 1x scope on there. My main fear is that the gas block from the Colt factory is going to be nearly impossible to remove without damaging the original barrel... I am starting to wonder if I should just buy a new 24" barrel with a different gas block on it. Or, just a new upper all together. Seems to me that it would be less work, and I would still have the option of a sturdy iron sight upper if I wanted to swap the uppers out. In essence it could be two guns in one at that point. :rolleyes:

May 15, 2010, 08:33 PM
I'm a huge fan of having multiple uppers, after all, what's the point in having a modular setup if a feller doesn't capitalize on it? There's pro's and con's to both and it all really boils down to personal preference. Those gas blocks/sights aren't all that hard to remove and replace- sometimes just time consuming and requires a bit of attention to detail to get your gas holes lined back up.

May 16, 2010, 06:42 AM
Another thumbs up for YHM, good product at a good price.

May 16, 2010, 05:25 PM
That goes along the concept of the Sig P250...

I am going to have a gun smith do it, as with my luck I will break/bend something.

May 17, 2010, 01:46 AM
Ask the GS if he will let you watch. Granted, not everyone has a high mechanical aptitude- but AR's are such a hoot to own, shoot, and tinker with, it'd be a shame to pass up on an educational experience. There's not much a feller can do to goober up an AR that can't be fixed- and if you learn something along the way then it wouldn't be a total loss form either end.

May 17, 2010, 04:19 PM
On my ASVAB, my mechanical was my lowest at a 107. Everything else was in the high teens. So I know my shortcomings. :D