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Posted: 7/4/2013 12:15:55 PM EDT
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Hi
I have a new build and got to shoot it at the range today. When firing it fails to reload completely, Im thinking its the gas key/ gas tube as the BCG doesnt get behind the next round and seems to hang on it. My rifle did fire five to ten perfect rounds near the end of the 30 round mag. im trying to get some insight as to what to check on my builld ? thanks guys please point me in the right direction if theres already a post detailing a new build like this that fails to reload , i also noticed scratches on the upper from where the ejected shells hit , anything i can check ? |
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It was Monarch™ SP .223 Remington 55-Grain Rifle Ammunition from academy, brass
http://www.academy.com/webapp/wcs/stores/servlet/Product_10151_10051_28721_-1__?N=813859366+4294938114+4294963046+4294954108&Ntk=All this is a new rifle just put together from new parts. when it was assembled the bcg was greased with oil i just got done cleaning the barrel and wiping it down. im going to have to take it out again to shoot and see whats going on, this next time i plan to video tape it with my sgs3 and hopefully that can give me more insight when i get that , |
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It may just be a little new and suffering from tight tolerances. The fact that it ran towards the end of the mag makes me think this. If so just keep shooting and it will break itself in. My next guess would be under gassed. Make sure the gas block is lined up correctly, if that fails make sure the hole is drilled to spec in the barrel. If the holes too small you wont get enough gas and it will short stroke like you described.
Can you give us the parts list from the barrel, bcg, gas block, spring and buffer? Is it Rifle, mid length or carbine? |
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I had help doing the final tightening up and the other forum member did a wonderful job also advised me on a few things to test and check but ive got my son for a few days and i will have to test those after he goes back
its a mid lenght 16" barrel , rifle is a carbine setup m4 flat top. i have been advised to use higher power'ed ammo and i plan to the next chance i get to take it to the range for testing. the BCG is a full auto M16 carrier the spring and buffer are from a PSA kit i bought full trigger kit with carbine back end six point adjustable stock. all PSA. Im not sure about the barrel i can check the listing where i bought it online. I will check back in this weekend after i get to take it to the range i was advised to put one round in a mag and fire to see if the bolt would lock back and i wish to test this. also going to try the higher powered ammo and was also advised to lube the crap out of the BCG because when we assembled it oil was applied but adding more wont hurt. i was told make it wet. hopefully will have more results and data saturaday... thanks |
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Quoted:
What kind of magazine are you using? I was wondering this as well. I had a GI mag that I left loaded for about a year (downloaded to 25) and the feed lips separated a bit. It caused a similar issue, wouldn't feed correctly until the last few rounds. My first thought was the gas system might not be perfectly aligned since many times people just install then to the barrel rib when that isn't necessarily where it lines up. Looking forward to hearing how this turns out |
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i have to go offshore for work ive locked the bolt back and oil'ed the ba jesus out of it , im thinking of keeping it in my safe like that is that alright ? bolt locked back ? dont know , but either way i roll out tomorrow for a `14 day hitch off shore, when i get back ill take it to the range again sorry guys thats the way my life is , been laying around the house playing with my rifle for two weeks and now its time to go back to work,
ive got two types of mags 1 from spring guns and ammo its only marking is 5.56 x 45 then on the bottom made in Korea , then i have 8 x thermold d&d inc wilson nc usa mags stamped law and gov use only lols ive only used two of them so far the one from SG&A and one of the thermolds . so heres a noob question when you say try more powerful ammo can you tell me in specific what to look for when im shopping , i know about the grains but im kinda lost on that , will have to read more about it . when i get back i will shoot it and let you know how it handles after being oiled and manually pulled and released half dozen times that i have done that , thanks *edit i dont know the tension / poundage on the spring , as i just bought a kit and threw it together , im no expert just started learning and this is the first one ive put together, all i really know is the kit i bought was a carbine length kit. the buffer and spring and kit is all PSA armory parts |
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What is your gas block set up? Do you have a low profile, a standard front sight base, or something else? Is there a hand guard cap or a shim/washer on the back side of your gas block? What we're getting at here is that if the gas block is misaligned with the gas port, it can cause short stroking.
Mags (betting this is your problem). First, don't run them full at first and see how that works (try only 5 rounds or so). This might help if there is an issue with the mag or if the rifle is just tight and working itself in. Next, try different mags (stick to quality mags only, my personal preference is GI mags). More powerful ammo? I believe he was referring to running some 5.56 x 45 as opposed to the .223 you are running. The 5.56 is a much higher pressure round. |
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Ive got a low profile gas block, only two hex screws on the bottom nothing else. theres no hand guard cap and no shim washer, I reached out to the fourm and another experienced user/builder helped my tighten everything up i owe him many thanks, He instructed me about the space on the gas block and how if you did not get that right it could cause that kind of issue. When im out i will order another mag and when i get home i will once again try the 5.56 ammo with limited amounts in the mag. I was also told to just put one round into the mag and fire it and see if the bolt would lock back after the mag became empty. next time im in i will give this a whirl and get back to you guys on the results.
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| ok , sorry to update so long afterwards ive had to work .... i got to shoot it yesterday and i tested it one round in a mag , and the bolt does not lock back at all i tried two of my diffrent mags and one of my buddy's mags and i tried his ammo which was 556 and my ammo which was 223 , all three mags both rounds same thing bolt never locks back. so im now looking to rip it apart to get to the gas tube and lowpro gas block |
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Quoted:
ok , sorry to update so long afterwards ive had to work .... i got to shoot it yesterday and i tested it one round in a mag , and the bolt does not lock back at all i tried two of my diffrent mags and one of my buddy's mags and i tried his ammo which was 556 and my ammo which was 223 , all three mags both rounds same thing bolt never locks back. so im now looking to rip it apart to get to the gas tube and lowpro gas block I assume you're using a free float handguard? Is the gas block pushed up against the shoulder of the barrel? If it is, It's too far rearward and is partially obstructing the gas port. |
| Yes , i had another member from here assist me with the final tightening of the build , he instructed me to this and he did show me what your talking about. he set it , and did the adjustment. it is not all the way back or flush but was brought forward just a tad, not sure as to the exact measurements as i don't have the necessary tools to pull it apart and check it will be a bit before i can get it tore down again for inspection. |
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I will check that shortly , can i post a pic of it up on this post ? if so i will edit shortly and post one , let me go grab it out of the safe and my phone , will edit shortly brb
http://i1287.photobucket.com/albums/a625/soydergto/IMG_20130820_014625_zps2c2aa082.jpghttp://i1287.photobucket.com/albums/a625/soydergto/IMG_20130820_013757_zps60a6467a.jpg |
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Youve got a midlength gas setup. Not carbine. I can also tell you misunderstood and have the PSA carbine buffer setup, so carbine buffer spring and buffer.
You are probably undergassed. What gas block do you have? Not all lowpro blocks require spacing, as some are made to sit against the shoulder. Possibly the person who installed it was unaware of your particular block and it could be too far forward. |
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Quoted:
Youve got a midlength gas setup. Not carbine. I can also tell you misunderstood and have the PSA carbine buffer setup, so carbine buffer spring and buffer. You are probably undergassed. What gas block do you have? Not all lowpro blocks require spacing, as some are made to sit against the shoulder. Possibly the person who installed it was unaware of your particular block and it could be too far forward. Yep. YHM has a couple of gas blocks that are made to set against the barrel shoulder. |
| What buffer weight? Standard power carbine spring? Gas block aligned properly? Gas tube installed properly? Gas key to carrier sealed up? Your rifle is short-stroking, especially if it won't run with 5.56 ammunition. And dump those mags you have currently and pick up some Pmags or quality USGI mags. |
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the vid's we took of the first shooting dont show much cause its indoors , i turn at the end and show the thing failed to reload. i will see where i stored them on my extrenal hdd and upload if possible ,
im lost what exactly is a "catywhompass." ? hehe google returned nothing ... "What buffer weight? Standard power carbine spring? Gas block aligned properly? Gas tube installed properly? Gas key to carrier sealed up? Your rifle is short-stroking, especially if it won't run with 5.56 ammunition. And dump those mags you have currently and pick up some Pmags or quality USGI mags." my plan is to get more mag's but at this present moment lack of funds prevent that , it will be a few more months until my $ is right and can aquire some more mag's and the price dropping on the pmags will help some but until the bills are alright and i have spending cash i am stuck with what i have. im not sure as the the buffer weight or spring power , i am under the impression that the lowpro gas block is not aligned properly now , i did not use my micrometer to check ther distance of the port hole to the distance on the barrel and now regret not looking at that when i did have the chance, as i previously mentioned i dont have the parts or tools necessary to take it apart and will have to wait to get that done again , i will reedit in a moment and find the links and pics of the gas block i used this is the pic from the fb page of the guy who sold me the gas block , mine is identical sry i know this isnt much to go on ill look and see if i can find more https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-frc3/970214_520761104653082_329233243_n.jpg |
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I would also check the gas block alignment. When you take it off, turn it so the set screw holes are on top. The rear screw hole typically lines up with the port hole on the barrel. This will give you the proper spacing and alignment. Take a marker and mark the barrel where the holes line up. This should help you with the gas block install.
FYI - When you are able to I would also recommend the following for a mid-length gas system. Buffer Spring: David Tubb Chrome Silicon Buffer Spring Buffer: Spike's Tactical T2 Buffer I have this in all my AR's and I have never had any issues. Good Luck!! |
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Hey
just wanted to update. i took it to a shop and the smiths tore it apart in front of me. they discovered that the gas tube was installed crooked. it has been realigned. even though i have not have a chance to shoot it ( i am hoping to get to the range tomorrow to test it) i will update once i get to shoot it to see if the under gas'ing was because of the tube being crooked. The smith checked the buffer spring also and said its the correct spring that its all carbine length buffer spring and carbine length gas tube. |
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