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Posted: 8/24/2004 9:37:02 PM EST
I bought an Olympic Arms 45caliber AR last year and immediatly started looking for someone to make a lower to accept the Grease Gun mags I owned. When I could find no takers I finally gave up and designed my own solution. I designed my AR lower to be a dedicated pistol caliber AR. It has an interchangable Magwell so that I can not only change calibers but also choose different types of mags in the same caliber. Since I shoot left handed I set it up for a lefty mag release.

I took it to the Indiana Subgun Championship match in June. I had literally finished fit the mags the night before and took it done there with the magwell still in the white. I had two mag out of the twelve I took with me that needed more fitting other than that it ran great.

BSumner.photosite.com
Link Posted: 8/25/2004 12:32:41 PM EST
Can you post any details on how you built this lower? Sounds very interesting...
Link Posted: 8/26/2004 3:07:11 AM EST
Damn thats sweet
Link Posted: 8/26/2004 4:32:15 AM EST
I know your gonna follow this up with some detail, arent you ?
Link Posted: 8/26/2004 8:16:23 AM EST
I updated my Photo file today.

http://bsumner.photosite.com/45CaliberARProject

I approached several manufacturers to build a lower for me that had the extra material around the magwell to accept the GG mags. Most refused, a couple told that it could be done but that I should be patient and wait until they could get around to it. I waited for about six months with no action. My patientance wore out and I started looking at 80% recievers but most of those already have the magwell edm'ed.

I found a lower that was suitable from DPMS and milled everthing forward of the firecontrol area off. I cut a dovetail into the reciever and a mating block of aluminum. After locating the postion of the front pin I drilled out the new block and installed the pivot pin. I then had a new magwell edm'd into the aluminum to accept the GG mags. Unfortunatly the location of the magwell was 30 thousandths to far foward.When I went to test fire it would only feed a couple of rounds before the nose of the bullet would hit the bottom of the upper and jam.

Back to the drawing board and a new block, I then moved the magwell location back to allow the bullet to feed. I took another trip to the range and test fired it. 30rnds loaded 30rnds fired without a hitch. At that time I did not have the mag release itstalled so I had to hold the mags into the magwell.

I looked at different types of mag releases and settled on the AR 15 style mag release. I shoot left handed and since I was building it why not build it to suit me. That left me with a dilema, the mag catch for the GG mag is on the right side of the mag. In order to stay legal I could not modify the mag in such a way the it could not be used it the original gun. I cound not locate the release to use the original mag catch so I used the AR mag catch and milled the GG mags so that they could be used in both the GG and my AR. I had to redesign the pin for the magrelease so that a new style button could be installed. I made the release button larger and reccessed it so that it would be easy to activate but not by accident.

It would have been a whole lot easier to bould a right handed mag release!!!!!!!!!!!!

After the magrelease was completed and I tested it again at the range I set about the task of thinning out all of the excess material. Thinning it out lighted my load considerably and made it look like it an AR again. I then finished it Brownell's Backing Laquer.
Link Posted: 8/26/2004 8:17:55 AM EST
sorry, here is the photo link again
http://bsumner.photosite.com/45CaliberARProject
Link Posted: 8/26/2004 8:23:05 AM EST
You are THE man.
Link Posted: 8/26/2004 12:11:26 PM EST
That is awesome! What do you do for work when you aren't modifying ARs? Some sort of engineering or machining work? That is amazing work... Wish I could get one too!

Spooky

Link Posted: 8/27/2004 8:55:39 AM EST
I have a severe case of what is called tinkeritus. I can't own anything without trying to make it better suit me.

I am in the proccess of building two more magwells, a 9mm for myself and 45caliber for a local gunshop.
He plans on using it in 3 gun matches.

I am also currently building a left handed upper using a Stag Arms Upper.

Bruce
Link Posted: 8/27/2004 12:25:34 PM EST
Did you mess up the area on the lower where the serial number is? That needs to remain untouched to be legal.

Link Posted: 8/29/2004 1:13:20 PM EST
The serial number is located just above the trigger group on the reciever I bought. One of the companies I contacted was more than happy to relocate the serial numbers on the reciever as long as I was willing to buy several and pay a $300 set up fee.
Link Posted: 8/31/2004 9:52:24 AM EST
Thanks for the detailed follow up.

Link Posted: 8/31/2004 3:34:44 PM EST
I want one that is sweet.
when is a manufacturer going to start building 45acp lowers that take gg mags lots of people i know are interested but few are as skilled as you were very nice.
Link Posted: 9/3/2004 6:08:47 AM EST
Very nice. I thought I my MK II lower/ Oly set up was cool. Yours gets my vote.
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