first time at the range with the new ar

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b_w.

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my 10.5 lmt defender arrived this week and i took it out for the first time tonight. what a sweet little unit it is. being used to my xcr it is so easy to handle:) if i had a camera i would take some pics.

first time at the range wasnt as smoothe as i hoped it would be. i was shooting 55g umc 223 and 55g pmc bronze 223. i maybe got one complete mag in all night without a jam or misfeed. if i was lucky i would get two in a row then it would fail to feed. most commonly it looks like it was scrapping the case and gouging it. i tried making sure i had the magazine all the way in and it kept doing it. the guy i was shooting with had a handful of green tip 62g pmc 5.56 that I tried and that was the most success i had this evening.

could it be that the pmc bronze and remmington ammo are not hot enough to cycle the action properly or what are your guys thoughts?

overall it was fun to get out with the new toy and like anything new there are a few hickups as you learn.
 
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I've never used Rem UMC, but I've run lots of PMC Bronze and Winchester white box through my 10.5" LMT with a regular carbine buffer. The only problem I've had with feeding is with fully loaded 10 round LAR magazines binding against the bolt carrier on a closed bolt. 1st gen PMAGs have never failed to feed.
 
Make sure you lube up the bolt/carrier really well.

[youtube]OXIsKEHo-4g&playnext_from=TL&videos=1zZ_wmmiP40[/youtube]
 
Needs less beano ! Fart-o-rama !

Some shorty's are finicky when new. Mine was.
It was set up for the military SS109 ammo and had problems with the low powered commercial fodder.

They get better when they loosen up and the barrel gas port system carbons up a bit, sealing it better for more oomph on the bolt.

Make sure you have the heavy duty extractor system and correct buffer.
Try a heavier buffer for more forward bolt force.

If there is still insufficient gas with low power ammo, you can try cutting a couple of coils off the buffer spring. I have a spare normal spring for the hotter ammo.

And LOTS of CLP on and in the bolt.

It worked for me :)
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Is it a used rifle?
If so then replace the gas tube.
What is the buffer?
Should be the 1 with an H marked on the center of it.
Now if none of these are issues with yours then it leeds me to believe that the gas port is not poperly placed over the vent hole on the barrel.
 
its a brand new rifle.

it is a failure to load. the case is getting scrapped for the entire length. sometimes it put a pretty good gouge in it close to the neck. i ended up tossing at least a dozen cartridges in the dud tank. unfortunately i dont own a camera to take a picture with.

I have not taken it apart yet. I just ran the bore snake through it a couple times prior to heading out. I will take it apart and see what type the buffer is and give it a good clp'ing tonight.

im new to ar's so i expected there might be some things I wouldnt be aware of.

thanks for the help guys:)
 
hmmn i dont have another lower to try it with unless anybody is planning on being at the spruce grove range tommorow...

what potential issue would that identify?
 
b_w. said:
its a brand new rifle.

it is a failure to load. the case is getting scrapped for the entire length. sometimes it put a pretty good gouge in it close to the neck. i ended up tossing at least a dozen cartridges in the dud tank. unfortunately i dont own a camera to take a picture with.

I have not taken it apart yet. I just ran the bore snake through it a couple times prior to heading out. I will take it apart and see what type the buffer is and give it a good clp'ing tonight.

im new to ar's so i expected there might be some things I wouldnt be aware of.

thanks for the help guys:)
Click to expand...

I wanna make sure I understand. Are you saying the bolt was coming far enough back to eject the round that was in the chamber, but not far enough back to pick up the next round (but the bolt was scrapping the next round int he mag as it went forward into battery without a round)?
 
mustang979 said:
I wanna make sure I understand. Are you saying the bolt was coming far enough back to eject the round that was in the chamber, but not far enough back to pick up the next round (but the bolt was scrapping the next round int he mag as it went forward into battery without a round)?
Click to expand...

yes. no problems ejecting. just picking up the next round. when it would fail to feed there would be a scrape the length of the cartride, sometimes a dent/gouge close to the neck.
 
First... make sure you actually have an "LMT" gun... I don't mean the marking/name stamped on the lower receiver, I mean the rest of the gun as well.

LMT does NOT sell their 10.5" guns as complete factory test fired rifles (not commercially). What you will have is a gun that's been assembled after the fact by a dealer or someone along the supply chain. They will have bought the lower and upper separately. They may well have bought the upper as an upper assembly and not as a complete upper half, meaning that they may have installed their own Bolt Carrier Group, charging handle, etc. and they may or may not have used LMT components... they also may or may not have properly checked the headspacing.

We have been contacted recently by at least one person who recently bought a 10.5" LMT "rifle" that (according to the customer) did not have an MP marked bolt in it and that means it was NOT an LMT bolt (LMT bolts are MP marked). Who knows what make it is or if the BCG was tested for proper headspace.

He also indicated (from his description) that it did not have the correct LMT buffer in it either.

It's also possible that the upper might not be an original 10.5" barrel length... if it's a 16" cut down to 10.5" then there would be an issue with the gas port size and that could cause the problem you're describing.

I'm not saying that what you have is not an LMT... but you are assuming that it's an complete factory LMT rifle simply because that's the name stamped on the lower receiver and by making that assumption you are overlooking a lot of other possibilities and potential causes for your problems.

LMT rifles (upper and lowers) come from the factory with inspection tags on them... I'll do a follow-up post in a few minutes showing what the tag on the upper should look like. If yours didn't have this then you should be able to ask for it from the dealer. It is very very rare that we get an LMT rifle, upper and/or lower that the inspection tag isn't either attached or put in with the item.

Mark
 
b_w. said:
yes. no problems ejecting. just picking up the next round. when it would fail to feed there would be a scrape the length of the cartride, sometimes a dent/gouge close to the neck.
Click to expand...
I've seen similar symptoms from the magazine not being seated all the way in... make sure it's fully inserted. Not saying that's your problem, but it might be.
 
You can tell it is a LMT barrel by looking at the stamping - 10.5" LMT barrel is stamped behind the gas block. 14.5"/16" is stamped infront of the gas block. If there is no stamping on the barrel - then it is not a LMT. Also, LMT uses flushed straight pins to fasten the gas block to the barrel.

You can also tell it is a LMT barrel by taking off the flash suppressor and look at the way the muzzle is finished.

LMT bolt is distinguishable from others -they changed the bolt slightly since 3 or 4 years ago at least. You can spot a LMT bolt easily.
 
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