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Building The Leftist’s AR

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CB900F View Drop Down
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    Posted: 21 November 2006 at 17:17

Fella's;

I've recently taken possession of a brand new stripped Stag AR lower.  The project is to build the total LH AR. 

I'd like this to sorta be an open forum of advice & suggestions as to parts & how to do it as I progress with the building.  Hopefully, it'll also be a how-to reference for anybody else who wants to do the same thing in the future.

However, one of the reasons I went with a stripped lower, besides the need for adventure, is that I can proceed at my own pace and budget.  Besides, you never know anything as well as when you do it yourself.  Who knows?  It might be a very good idea to be familiar with the guts of the AR if the banners have their way come the next election.

So, for right now, the cost is $90.00 for a stripped Stag LH lower delivered.  Also, for right now, I gotta tell you I couldn't tell the difference between a RH lower & a LH lower if my life depended on it.  See?  It's gonna be a learning experience for everybody, 'cept King if he chimes in.

900F

 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2007 at 02:40

Fella's;

OK, time to update.  Prince sent me a package, everything was packed in purple!  In the package was, among other things, a lower parts kit for  the AR.

I assembled this kit into my lower last night using the build thread at AR.com.  A couple of words about that.  Although the AR.com information is invaluable, it still could be significantly improved.  Whoever put it together is obviously very knowledgeable, but because of that, simply cannot understand how a total newbie such as I can miss things.  The two things that made me scratch my head & wonder were the exact placement of the bolt catch roll pin, and placing the hammer in the lower.  The build thread kinda makes it read like the roll pin goes into the spring recess first & then the spring and plunger go in on top.  That's not the case.  The pin is tapped into the first 'ear' just over the recess, then the spring & plunger go into the recess, the bolt catch is placed over the plunger & held while tapping the roll pin the rest of the way through.  All you need is three hands & the ability to make the walls blush.

The second thing that stymied me, was the way the hammer spring & hammer fit into the lower.  I, for the life of me, could not figure out the proper placement, no thanks to AR build thread either.  I finally found a picture that obviously by accident, just barely, showed the closed loop of the hammer spring in the proper position.  FYI, the closed loop of the spring doesn't go forward of the hammer.  It gets wrapped to the rear of the hammer, then the hammer is forced against the spring pressure, with the long legs on top of the trigger pin, into position & the hammer pin is pushed into place.

The www.AR.com thread is located at "build it yourself" on the home page.  From "build it yourself" go to "Assemble your own, lower, upper, free float, etc."  The picture of parts in the lower kit is of great help.  Could be a little clearer, but study it & it all can be figured out.

Now I have a built lower that supposedly works.  All parts were supplied by Kingpin & thank you sir.  It has a Knight national match trigger and an A2 buttstock. 

900F



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Post Options Post Options   Thanks (0) Thanks(0)   Quote OK hunter Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2007 at 15:23

Where are you on your build up?  I have one that I built but decided not to go LH with it.  I put a 24" bull 1-8" twist on it and feel it can do about anything except turn around inside an elevator.  I may have to saw a couple inches off the bbl.  It's pretty long. 

Huh, I've never in my life complained about something being too long... 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2007 at 17:46

OK;

Alrighty then, time to update.  I ordered the Stag LH flattop upper receiver, the LH bolt carrier assembly, and the ambi selector lever.  In due time, all the parts arrived and I got to write a check.  Gad I hate writing checks.

I turned right around and fired the parts off the nether ends of the continent, specified a 20" barrel, gas block - no front sight assy needed for these decrepit old eyes, and a free floated fore end.  I haven't heard anything lately, but then I haven't had to write any more checks either.

900F

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Post Options Post Options   Thanks (0) Thanks(0)   Quote OK hunter Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2007 at 05:40
sounds just like what I did.  If you do a round free floated forend you will want to drill a hole in the bottom of it (after assembly) so you can put a bipod adapter.  They really do shoot well.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote deaddog Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 2007 at 07:10

If you turn the whole thing upside down the brass will be expended from the correct side of the weapon when fired.

 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2007 at 16:25

Fella's, and peanut gallery;

The left hand upper has returned from the nether end of the continent!  Now comes the adventure of mounting the optics.

I've got a Nikon Monarch 3.3-10X A/O mil-dot to put on the upper, but am unsure of the ring height I'm going to need.  The objective bell of the scope is 54mm exactly.  Near as I can tell, there's 5mm from the top of the rail to the top of the handguard.  Which would make a 1" (25.1mm) high Weaver mount real iffy close to being just right or just wrong.  My calc's say just right.  One half of the objective diameter is 27mm.  If the mount is exactly 25mm, that'd be -2mm.  But the 5mm from the rail top to the handguard should then bring it to +3mm, or very slightly under two tenths of an inch.

If the Leupold Weaver-type picatinny rail ring &  mount set-up is indeed 1", then that's the way I'll probably go.  However, I'm open to suggestions if you know of a setup that works for sure.  Just, no Burris please.  I get testy on that subject.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 13 June 2007 at 14:10

Fella's;

The Leupold high mounts arrived today.  I just finished putting them on the gun & placing the Nikon in them.  It worked out that the Loopy high rings do have enough clearance in this application.  However, clearance isn't the issue, it's getting the scope high enough relative to the buttstock to be positioned properly to the eye.  If anything, the Leupold high rings put the scope just a shoch too low.  I may have to go to the X-high rings.  Drat!

It's not too low to see through, and I'm pretty sure I can make it work; it's just that I have to make it work.  It's just a hair low to be a natural position.

In any case, I'll go string it now & get it ready for sighting in.  Later.

900F

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 13 June 2007 at 15:40

Fella's;

Well, well, well.  The Stag ambi safety will not work with the Knight trigger group.  The mil-spec lever will because it is approximately .020 wider across the critical flat.  I could bitch to Stag, which wouldn't do much good since I'm sure their ambi lever works with their trigger group & their sympathies would be limited to say the least.  Or, I can take both to the machinist & ask him to make this match that.  Which will take an application of money.  Bah!

900F

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Post Options Post Options   Thanks (0) Thanks(0)   Quote OK hunter Quote  Post ReplyReply Direct Link To This Post Posted: 22 June 2007 at 15:22
I think the guy who said "you can build one up for not much money" was speaking with forked tongue. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote OK hunter Quote  Post ReplyReply Direct Link To This Post Posted: 22 June 2007 at 15:25
Originally posted by CB900F CB900F wrote:

Fella's;

Well, well, well.  The Stag ambi safety will not work with the Knight trigger group.  The mil-spec lever will because it is approximately .020 wider across the critical flat.  I could bitch to Stag, which wouldn't do much good since I'm sure their ambi lever works with their trigger group & their sympathies would be limited to say the least.  Or, I can take both to the machinist & ask him to make this match that.  Which will take an application of money.  Bah!

900F

I had the same problems with Warne extra high rings.  I finally bought a Larue QD mount that cured the problem.  They are expensive but dammit, they are good and allow my Burris 4-16X44 to fit up perfectly and my head is right in line.  I don't have to try to make it work, as you were talking about.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Irish Bird Dog Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2009 at 16:18

Brownells offer  AR build information also and they have a specialty catalog just for the AR guy.  Try them.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 11 March 2009 at 01:45

Fella's;

I can see I've been remiss on updates here.  The situation is now this:

The unit would not feed correctly.  I tried all kinds of magazines, different kinds of ammo, voodoo chants at midnight, and soaking the action in Tri-Flow.  Nothing made it a reliable feeder.  So it got packaged up & sent back across the country.

It seems to have arrived with a different barrel.  It also arrived with a set of Nightforce rings!  The rings were 30mm though.  So, off to the Brownell's catalog & ordered a set of the Delrin inserts that then allow a 1" scope to be mounted in 30mm rings.  Bingo!!  We have a winner.  The scope is now perfectly positioned to my eye.  The gun feeds.  And winter is here.

Between winter, and the gun club playing footsie with my membership check, there's been no range time.  Load development has been non-existant, but will proceed.

900F

 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote NH_Hunter Quote  Post ReplyReply Direct Link To This Post Posted: 11 March 2009 at 07:04
Wow! Quite the adventure you have had with that AR there CB! I decided to go with a righty AR and just swap the safety around (Oly's stock safety works from either side of the gun) because of its intended use, it is easier for me to check for malfunctions if I can simply look into the chamber. I don't really lose time with anything else, but I definitely see the apeal of an all lefty AR. The biggest handicap you might run in to is the bolt release/catch. Mine is just a touch stiff to do easily with my trigger finger. Maybe yours is different. Can't wait to hear your range report! What is the twist rate on your barrel? 
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