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 Post subject: ATI Poly AR
PostPosted: Sat Apr 08, 2017 12:12 pm 
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Joined: Mon Dec 31, 2012 10:52 pm
Posts: 3362
Location: Minnesota
Favorite Hi-Point: 40SW
Gender: Male
Location: Minnesota
Age: 50
Through some horse trading and such I wound up with two ATI Hybrid lower receivers and one of their Hybrid upper receivers. The bottom one in the picture was built with an Anderson lower parts kit and a Trinity Force Alpha stock and buffer tube kit. To that I installed and Anderson complete upper with Bolt Carrier Group in 300 AAC Blackout. The scope is a Millet Red Dot from Midway that someone posted here a while back.

Image

The top one was built with some parts I've never used before so I'll list them.
ATI Omni Hybrid upper and lower receiver
Apoc Armory enhanced lower parts kit
Trinity Force, Alpha stock and buffer set (I like this stock and the price isn't bad)
Cotton Arms 16" mid length 5.56/223 barrel with 1:7 twist
Muzzle brake from eBay
Low profile gas block from eBay
Cotton Arms stainless steel mid length gas tube
15" Slim Keymod handguard
NCstar 4x tactical scope

I ran 60 rounds through the 300 Blackout because that's all I could afford just to test fire and break in. Someone that will remain nameless left the red dot on so the battery was dead and I couldn't use it. the rifle had one hiccup when I did 20 rounds rapid fire but no others. When I got home I tore it down for cleaning and there was no noticeable wear but it was filthy.

The 5.56/223 with the ATI Omni upper and lower was a different story but I was shooting my reloads that I have had some chambering issues with in other rifles as well so I can't blame the rifle.

The scope was on a different rifle that was sold and I kept the scope (I should have made them take the scope, I don't like the reticle) and after missing the target 60 times (I like to shoot sometimes and it was a long winter) I zeroed the scope and started again and in 20 was hitting the bullseye at 25 yards (I start at 25 yards when initially sighting in a rifle then move out) so I shot another 40 rounds.

When I got home I tore it down to clean and inspect and was impressed that the lower didn't have any visible wear and the upper wasn't anything that you wouldn't see on any other upper. The trigger is still kinda gritty and I probably won't get another Apoc lower parts kit but it was nicely polished and breaks at 6.5 pounds consistently.
The Cotton Arms barrel was a blemished barrel that I picked up for $65 and $8 for shipping and seemed to work pretty well but I need more rounds down range before it gets my seal of approval.

I'm pretty happy with these rifles so far, I'll post more after I shoot them more.


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 Post subject: Re: ATI Poly AR
PostPosted: Sat Apr 08, 2017 12:52 pm 
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Joined: Thu Oct 30, 2008 8:24 am
Posts: 11283
Location: Western Nebraska
Favorite Hi-Point: 995
Gender: Male
Location: Yonder
Age: 53
Thanks for the write up Scott
I've wondered about those hybrid lowers.

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 Post subject: Re: ATI Poly AR
PostPosted: Sat Apr 08, 2017 1:53 pm 
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Joined: Wed Feb 23, 2011 2:39 am
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Favorite Hi-Point: C9
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All that plastic must make for a really light rifle? I hate plastic in most all the forms it comes in but I can also say i have experienced some plastics that would confound the devil himself when trying to break it or destroy it. :twisted: Mix a little embedded metal into it and it becomes essentially bombproof... Hmmm :thinkin: Duh!

Might be a stupid insult but could the feed issues (I am making an ass out of me here) be the result of using brass fire-formed in a different rifle? No direct experience with that but a lot of what I've read implies that after a case is once used in a rifle, then reloaded for that rifle, a lot of feed issues go away as long as the length is kept in check. :dunno:

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 Post subject:
PostPosted: Sun Apr 09, 2017 12:57 pm 
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Location: Minnesota
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Location: Minnesota
Age: 50
I trimmed all my brass to length and full length resized. Since this is my stash ammo I want it able to fire in most anything. I need try the other full length sizing die I have.

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 Post subject: Re: ATI Poly AR
PostPosted: Sun Apr 09, 2017 11:10 pm 
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Joined: Fri May 30, 2008 3:32 pm
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Favorite Hi-Point: 4095
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The ATI Omni is actually a pretty good lower.. I have one on a 300 blackout.. they have aluminum embedded in the plastic at all of the stress areas, and have an actual metal lower parts kit in them instead of the plastic kit in the plumb crazy lowers.

Cant say much about the uppers, haven't seen one yet.

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 Post subject: Re: ATI Poly AR
PostPosted: Mon Apr 10, 2017 7:06 pm 
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Joined: Fri Oct 22, 2010 1:08 pm
Posts: 3239
Favorite Hi-Point: 40SW
Gender: Male
Location: missouri
Age: 51
I built three AR's on polymer stripped lowers from New Frontier, no metal at all in those. Ran into one that had problems, turned out to have voids in the material that let it flex, the bolt would hang up inside the buffer tube after a shot, then if you relaxed your hold on the rifle (on a rest, it didnt do this if you were just free-handing it unsupported) then "SPROING" the bolt would slam forward. Lifetime warranty, so all I had to do was send it in and they sent me a new one. Ran about 500 rounds through each of them so I knew they were trouble-free, then eventually traded or sold all of them off. Traded one of them for a WASR 10/63 that's been an awesome rifle.

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 Post subject: Re: ATI Poly AR
PostPosted: Tue Apr 11, 2017 2:39 am 
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Joined: Sat Mar 02, 2013 12:09 pm
Posts: 5098
Favorite Hi-Point: 45ACP
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Age: 49
I have the ATI HYBRID lower and an Anderson upper in my hunting AR and no problems so far.
I've fired a rifle with the ATI upper and lower together - but that's all - just a few rounds and it seemed fine to me.

I'm glad Scott gave us a more thorough test with the polymer receivers.

I guess if they were a POS - they wouldn't be selling so many of them!!

My supplier has sold thousands of these lowers...

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