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Posted: 12/18/2013 12:51:50 PM EDT
This is my Black Friday Cheapo Build...she's going to get a stock eventually once i get my stamp back 
In the meantime i'm dubbing her the "honey bee" Specs: prices to nears round $ KAK Brake - 29 KAK Gas Block - 19 Alpha Shooting Sports 7.5" 5.56 Barrel - 120 Troy Alpha VTAC Rail - 120 Gas tube - 8 PSA Sights - 70 (for the pair) BCM Charging Handle - 35 Misc upper parts - 12 Aero Upper Receiver - 70 LPK w ambi safety - 35 (local GS special) Anderson Arms Lower - 50 Magpul Bad Lever - 20 Magpul K grip -15 from EE Pistol Tube - 20 Lazer Etching - 5 Duracoat (Ultra Flat tactical Coyote Brown & Combat Grey)- 80 Total: $708 p.s. the buffer, spring and bolt i had lying around anyway but there were some pretty smoking deals on over black friday....so not sure what that would have added. p.p.s. please forgive the rail covers i was trying to be arty 
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Quoted:
Nice build and done on a decent budget. I want to put mine together but I'm going to have to wait until spring so I have warm enough weather to spray and bake the cerakote and dip graphics myself. Yeah i did the duracoat at 28 degrees and it was not a good idea but the finish ended up being ok..ended up dragging my painting box into the kitchen. |
| I'm loyal to eotechs but i don't think one would look right on it so i'm open to suggestions. Maybe an aimpoint? Like i said i wish i'd gone with the primary arms micro during the sales. Thanks for the compliments guys hopefully i will get her to the range at the weekend. |
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Range report:
Ok took her out the range today and shot her at 25 yards. Accuracy was ok and the sights performed just fine I am however having an issue. The first two rounds fired ok. Then I started having extraction issues. I put about 30 rounds through it and gave up because i also had a FAL i wanted to shoot and it was starting to rain. Basically the empty casing is being forced upwards and not extracting properly from the chamber while the second round is being fed in from below. All in all it looks like maybe the pistol is short stroking. I also checked the bolt and extractor both of which checked out ok. I took it to a gunsmith i trust just because i always like a second opinion. His thoughts: 1) Run the gun through the extraction and see if it settles itself out...i.e. clear the blockages and keep going for a hundred or so rounds. 2) use some heavier grain ammo I was shooting 55 grain ammo. 3) buy a pistol buffer system (that is a lighter buffer). I am currently running a pistol buffer tube with a carbine buffer and spring system, the tube i bought is supposed to work with a carbine system. Another thought: I am using a KAK gas block. When i put it on it slid over the barrel with very little resistance and is basically flush with the barrel shoulder area. I guess i can try moving the block forward also. Am i mad in thinking that this could be short stroking or could the problem be what he suggested? Thoughts appreciated. I've built lots of carbines and rifles but as this is my first pistol i'm a little stumped. p.s. the KAK brake is awesome!...there was very little excessive noise or blast felt. The guys in the lane next to me even complimented me on how quiet it was from the side for an AR pistol. p.p.s. i was thinking about throwing a rifle buffer tube on it with no stock with a rifle buffer system in it just to see if it would cycle reliably. I guess i just need to shoot it until it runs. Crappy diagram...clearly the bolt would also be in this pic if i had taken it myself this is just to show the location of the two rounds... 
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IMO, that's classic undergassed/short stroking. Friend's rifle build did it with a misaligned gas block and my 10.5" pistol was doing it (gas port too small).
First double check the gas block alignment. Were you shooting .223? If so and you could try some 5.56 and if there's no problem with 5.56, definitely undergassed. Gas key tight, rings ok? You can try a rifle tube/buffer (rifle buffers are between H2 and H3 weight), will likely make it worse, but worth a shot if you've got the parts. |
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Thanks your thoughts are kinda what i'm thinking, after checking everything else just now i'm beginning to think the issue is either the gas block is too far back or there is a blockage somewhere (either hole is too small or something in the gas tube or something like that). Will running some 5.56 through it tomorrow and check that if not then i guess it's time to get that damn rail off the thing and mess with the gas block. ARGH!
p.s. just emailed Kurt with KAK, what a fantastic company, he got back to me within 30 mins. apparently the gas block can sit against the shoulder of the barrel for that block. Will still check the hole size etc after a run with some higher pressure ammo tomorrow. |
| Which bcg was it? I started to order a psa ptac until I saw some reviews and was glad I didn't when I found the spikes for $112 shipped. I would be interested in knowing which part on the bcg is not right. If it is a replacable part it might be good to have an extra. |
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Which bcg was it? I started to order a psa ptac until I saw some reviews and was glad I didn't when I found the spikes for $112 shipped. I would be interested in knowing which part on the bcg is not right. If it is a replacable part it might be good to have an extra. Still trying to figure that out as the bolt, extractor, cam pin, firing pin etc all seem to be fine. The carrier itself is very tight in the upper and could potentially be out of spec i'm not sure. I've had the bcg for a couple of years but it's never been used. it wasn't a psa but to be honest i got it so long ago i don't remember the brand. I got it from midway some time ago. |
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Likely! What ammo were you using? Quoted:
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pm sent.. you need an oring 100 percent.. Likely! What ammo were you using? Firstly thanks for the pm's always nice to know I have people to help when I'm being moronic. Anyway I used a variety of ammo from cheap .223 55 grain to some much heavier 5.56 which is when I figured it wasn't a gas problem but a bolt one. Hence why I swapped out the bcg and everything worked perfectly. |
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i like it...partial to that style though... http://i204.photobucket.com/albums/bb128/tealm0nsta/sticks/0EF4AEBD-C96C-4776-80B4-8F1410B17B35_zps2oe3q0fp.jpg Hot! glad someone else has some good taste around here! |
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