Jump to content
Brian Enos's Forums... Maku mozo!

T Bacus

Classifieds
 View Profile  See their activity

  • Posts

    643

  • Joined

  • Last visited

 Content Type 

Posts posted by T Bacus

    9MM AR Lightweight Barrel/Muzzle Device Options

    in Rifle - Technical

    Posted

    I milled .011" off the front of the bolt. Headspace is still a little deep but it ignites 100% now. Not the best way to fix it, but the best way I had with the tools at hand.

    I tried a couple of makes of factory ammo- looks like .125 to .1285. I have a bolt coming, I will go ahead and assemble it and see what it looks like from underneath with the bolt forward and a cartridge in the chamber.

    Holding the barrel vertical with a case in the chamber, slowly press the bolt down against the barrel. If the case snaps under the extractor you should be alright.

    armalite 18" loads 223

    in Rifle & Shotgun - Technique

    Posted

    First off, nobody shoots 18" barrels anymore. If you are not shooting a 16" or shorter barrel you are so far out of the mainstream that your opinion does not matter to any 3 gun shooting red blooded American. If you are still shooting anything longer than a 16" barrel you will be forced to wear a red and black plaid hunting hat and speak with a pronounced speech impediment. Now this only goes for rifles, shotguns are just the opposite, and should be as long as possible, because all the reasons for a short rifle do not apply to shotguns, cause thats the way is. If you did get your barrel trimmed down to a more acceptable 16" length then you could shoot anything that you wanted at targets less than 200 yards, and 69 grain or heavier on targets past 200 yards, but only east of the Mississippi, west of that you can use 55 grain for everything. As cleverly noted above if the target is at exactly 200 yards and not an inch longer or closer, then you MUST use a 77 grain bullet. Fortunately it is nearly always possible to take a half step back, thus slightly altering the target range so you could use your 55's against those pesky 200 yard demons.

    Oh my God!!!! Game changing!!!!

    9MM AR Lightweight Barrel/Muzzle Device Options

    in Rifle - Technical

    Posted · Edited by T Bacus

    I found a lightweight profile 16" barrel for $109 that weighs 19 oz so that is on the way- I can always have my AR guy chop and rethread should I decide I want to run a pinned comp at 16" OAL. For now it will get a thread protector and loctite.

    I'm guessing this is the one you ordered? http://www.joeboboutfitters.com/Kaw_Valley_Precision_16_9MM_4150_QPQ_AR_15_Barrel_p/kvp-9mm-bbl-16-laser.htm

    I just put together a PCC with this barrel. I also wanted it as light as possible, but didn't want to deal with NFA stuff. This was the only lightweight profile 16" barrel I could find and I looked pretty hard because they were sold out for a few weeks, but I waited for it to come back in stock since I couldn't find anything else. I haven't shot it yet, but did notice that the chamber is really tight. Rounds that will easily pass my EGW gauge (which is pretty tight) aren't all plunking completely freely into the barrel, but it I think they'll still chamber fine.

    That is indeed the barrel I ordered. I should have it in hand tomorrow, I will drop test some factory and the typical coated lead loads that will be used in it.

    When you get it check case protrusion before assembling - drop a round or piece of brass in the chamber and measure how far it sticks out. It should be .135" to get proper headspace. I didn't think to check this before assembling mine and now am having headspacing issues. I'm going to pull the barrel and measure mine; I think the chamber is cut too deep.

    Assembled an upper for a friend with this barrel and had lots (like 90%) of lite strike problems because of excessive headspace. I fixed the issue but it would have been nice to not have too. If I recall correctly, case protrusion was around .118. Other than that, it is a really nice barrel and my friend really likes the lightweight profile. The gun handles great with a very light feeling front end.

    Bolt Catch Plunger Stuck

    in Rifle - Technical

    Posted · Edited by T Bacus

    Had this happen once to one of our rental guns. The detent was stuck because the top of the hole it's in was slightly compressed. I used a sharpened triangular file to bevel the top edge of the detent hole and it popped right out.

    KgKQx7.png

    16" vs 18" barrel

    in Rifle - Technical

    Posted

    There are many right answers and no perfect one. 16 and 18 are both fine, mid or rifle length gas is fine too. My current setup is a Mega Arms 16" rifle gas & Seekins adjustable gas block combined with a Vltor A5 recoil system and a JP stainless LWBCG and JP comp. My rifles recoil is flat and soft, but there are many other combinations of components that will work just as well. Really, with any decent set of parts it's the shooter not the gun.

    Which brake / comp on PCC

    in Rifle - Technical

    Posted · Edited by T Bacus

    Currently helping a friend set up a gun for pcc. We chose one of the Armalite comps for his gun. I opened the exit holes to 9mm and we sent it and the barrel out to be shortened, pinned and welded to 16". When done it will look just like one of the 13.5" Armalite rifles. Will post pictures when it's finished.

    As for the op's original question, look at the JP 9mm comp. I think best effect will come from maximum frontal area for the gas to work against. With pistols you want to keep the muzzle down so upward porting is effective. With rifles you want to push the gun forward so wide flat ports that vent to the sides work best.

×
×
  • Create New...