View Full Version : LMT MRP FTF.
Mauser KAR98K
02-20-12, 01:49
I've searched, but o no avail.
I am having FTF is in a recently purchased LMT MRP (used). Every thing on the upper is good. I have a MOD4 gunfighter charging handle, and a BCM BCG. The issue occurs when I hand charge the weapon from a loaded PMAG or US GI mag: the round gets stuck on the feed ramp. After I "recharge" the handle, it feeds the hung round into the chamber. Cycle manually it happens about every second or third round. No problems releasing the bolt to chamber a round.
The lower is a Noveske Gen II flared lower with a DD LPK, and a Magpul UBR stock. BCM action spring with a H buffer. I have noticed that the bolt catch has some newer ware marks and I can feel the bolt, when i slowly close it, rubbing up against the bolt catch, causing a little resistance.
My first round of firing, I didn't lube it the bolt, causing FTE's (naturally). After lubing, and running some reloads I had, the weapon feed two 30 rnd mags fine. However, the factory ammo I am using for home defense at the moment (American Eagle 5.56 .55gr and PMC .55 gr) are the ones giving me the problem.
What is going on?
LowSpeed_HighDrag
02-20-12, 03:55
I had an LMT MRP that would simply not function with BCM BCG's. No clue why as they function fine in every rifle I tried them in. I ended up selling the MRP, partly because I wasnt in love with it, and partly because I just didnt trust it. :confused:
Can you explain "handcharging"? What happens when the bolt is locked to the rear, you insert a magazine (good quality and not overloaded) and you release the bolt catch or the charging handle?
Mauser KAR98K
02-20-12, 09:17
Can you explain "handcharging"? What happens when the bolt is locked to the rear, you insert a magazine (good quality and not overloaded) and you release the bolt catch or the charging handle?
Manually charging the weapon.
With the bolt in the locked position, it does fine.
Mauser KAR98K
02-20-12, 09:18
I had an LMT MRP that would simply not function with BCM BCG's. No clue why as they function fine in every rifle I tried them in. I ended up selling the MRP, partly because I wasnt in love with it, and partly because I just didnt trust it. :confused:
This is even happening with a semi-auto BCG I have.
If the bolt is locked to the rear, and you insert a magazine and release the bolt catch. What happens?
Manually charging the weapon.
With the bolt in the locked position, it does fine.
Mauser KAR98K
02-20-12, 10:24
It chambers a roundfine most of the time. Only had it FTF once thus far.
I had just got done with a series of test, and I was having FTF's during the course of fire. A lot, and in no particular pattern of FTFs. I have attached some pics of what I think are the problem areas. I am also getting carbon jected back towards me, because I am getting carbon on the rear lens of my Aimpoint.:confused:
http://farm8.staticflickr.com/7056/6910335401_b1866869c5_z.jpg (http://www.flickr.com/photos/29467239@N04/6910335401/) 2012-02-20_09-59-35_38 (http://www.flickr.com/photos/29467239@N04/6910335401/) by mauser_leo (http://www.flickr.com/people/29467239@N04/), on Flickr
Brass residue on the right side of the receiver:
http://farm8.staticflickr.com/7067/6910330803_904cd8ef0e_z.jpg (http://www.flickr.com/photos/29467239@N04/6910330803/) 2012-02-20_09-58-56_867 (http://www.flickr.com/photos/29467239@N04/6910330803/) by mauser_leo (http://www.flickr.com/people/29467239@N04/), on Flickr
http://farm8.staticflickr.com/7055/6910326821_d132b633ca_z.jpg (http://www.flickr.com/photos/29467239@N04/6910326821/) 2012-02-20_09-57-35_22 (http://www.flickr.com/photos/29467239@N04/6910326821/) by mauser_leo (http://www.flickr.com/people/29467239@N04/), on Flickr
http://farm8.staticflickr.com/7036/6910324301_feefec573d_z.jpg (http://www.flickr.com/photos/29467239@N04/6910324301/) 2012-02-20_09-57-24_117 (http://www.flickr.com/photos/29467239@N04/6910324301/) by mauser_leo (http://www.flickr.com/people/29467239@N04/), on Flickr
http://farm8.staticflickr.com/7208/6910322179_e911653bf5_z.jpg (http://www.flickr.com/photos/29467239@N04/6910322179/) 2012-02-20_09-57-05_103 (http://www.flickr.com/photos/29467239@N04/6910322179/) by mauser_leo (http://www.flickr.com/people/29467239@N04/), on Flickr
Honestly I don't know what to say. I would contact LMT and see what they can do.
MikeCLeonard
02-20-12, 11:41
Remove the B.A.D. lever and retry.
Remove the B.A.D. lever and retry.
Agreed... The bolt catch looks like it's taking a beating.
I can't see the pics because of the internet filter we have here. But, once again. Lose the BAD and let's see what happens.
ICANHITHIMMAN
02-20-12, 12:58
I have the same system to the tee. I also had the same issue you are having. I went through 2 gas tubes and 4 barrel bolts before I checked my BCM bolt. It looked good to go from the factory and the reputation is top notch so it was the last thing I thought of. I replaced the gas key re torqued my bolts, then used the staker tool. My rifle is good to go now.
The key was not loose it just was not tight enough. Also get rid of the bad lever and make sure you getting the right torque setting and torquing front to back.
http://farm8.staticflickr.com/7036/6910324301_feefec573d_z.jpg (http://www.flickr.com/photos/29467239@N04/6910324301/) 2012-02-20_09-57-24_117 (http://www.flickr.com/photos/29467239@N04/6910324301/) by mauser_leo (http://www.flickr.com/people/29467239@N04/), on Flickr
Are those shiny spots below the feed ramps I see? If the bullet tip of the round coming out of the mag hits down there it won't feed.
Mauser KAR98K
02-20-12, 13:57
Are those shiny spots below the feed ramps I see? If the bullet tip of the round coming out of the mag hits down there it won't feed.
Picture is upside down. ;)
Talked to LMT about an hour ago, and they are recommending that I polish the feedramps with a drimmel. Then they also recommend that I check the barrel to make sure it is seated correctly.
I did take the BAD lever off, and it still did the same thing.
I will go over the BCG once more, but everything looks ok.
Thanks
Mauser KAR98K
02-20-12, 13:59
I have the same system to the tee. I also had the same issue you are having. I went through 2 gas tubes and 4 barrel bolts before I checked my BCM bolt. It looked good to go from the factory and the reputation is top notch so it was the last thing I thought of. I replaced the gas key re torqued my bolts, then used the staker tool. My rifle is good to go now.
The key was not loose it just was not tight enough. Also get rid of the bad lever and make sure you getting the right torque setting and torquing front to back.
This is happening with two BCGs.
"I am getting carbon on the rear lens of my Aimpoint". do you have the proper torque tool? I would pull the barrel out and re-seat it. I don't think polishing the feed ramps is it. I would also try the lower on another upper?
Mauser KAR98K
02-20-12, 18:34
"I am getting carbon on the rear lens of my Aimpoint". do you have the proper torque tool? I would pull the barrel out and re-seat it. I don't think polishing the feed ramps is it. I would also try the lower on another upper?
Ditto, and ditto.
I have a carbine upper that works flawlessly with the lower.
I am about to take the thing apart, to a good cleaning, polish the feed ramps, and reset it.
Mauser KAR98K
02-20-12, 20:58
After a major cleaning job, scraping of carbon build up off the barrel and gas tube, polishing the feed ramps, and resetting the barrel back to the receiver...
...It has functioned, albeit no live fire, flawlessly after manually cycling a full magazine through. I do not even feel the bolt rubbing up against the bolt catch. And yes, I am leaving the BAD lever off, though I am going to miss it bad.
Picture is upside down.
It looks like some bullet tips are hitting below the feed ramp, or to right at this picture angle.
I wonder if the barrel was loose or off center or both. That could explain it. Do you have dummy rounds that you can SAFELY cycle through the weapon?
After a major cleaning job, scraping of carbon build up off the barrel and gas tube, polishing the feed ramps, and resetting the barrel back to the receiver...
...It has functioned, albeit no live fire, flawlessly after manually cycling a full magazine through. I do not even feel the bolt rubbing up against the bolt catch. And yes, I am leaving the BAD lever off, though I am going to miss it bad.
Apricotshot
02-21-12, 12:05
After a major cleaning job, scraping of carbon build up off the barrel and gas tube, polishing the feed ramps, and resetting the barrel back to the receiver...
...It has functioned, albeit no live fire, flawlessly after manually cycling a full magazine through. I do not even feel the bolt rubbing up against the bolt catch. And yes, I am leaving the BAD lever off, though I am going to miss it bad.
I really don't see where the BAD lever would have anything to do with it. I have the same set up in my MRP: BCM BCG, BAD lever. Mine functions fine, always has.
Mauser KAR98K
02-21-12, 12:21
I wonder if the barrel was lose or off center or both. That could explain it. Do you have dummy rounds that you can SAFELY cycle through the weapon?
I live out in the country, so cycling was down down range of where I usually shot.
In fact, I just ran 150 rounds through it, and hard. Flawless. Everything worked...except me having to learn to hit the ping-pong paddle again.:mad:
If fact I was running some rifle/pistol transition drills.
Then the Sheriff shows up. One of my neighbors called saying that some one was shooting a high powered rifle "recklessly". Deputy(ies) came and saw I was shooting in a safe direction and took note of the grouping pattern in the "A" section of the IPSC target.
"Sorry to bother you. Never seen a one piece upper before." One of the deputies remembers me and my dad helping them catch a meth-head two years ago that ran in the back of our wood line.
Apparently single shot for sighting in, or "normal" sounds of hunting is the norm, but oh damn, someone is letting loose rounds, they "must" be shooting unsafe.:rolleyes:
I'll admit, for the neighbors, it did sound like WWIII, for them at least.
Mauser KAR98K
02-21-12, 12:22
I really don't see where the BAD lever would have anything to do with it. I have the same set up in my MRP: BCM BCG, BAD lever. Mine functions fine, always has.
I'll probably put it back on later, but for now, it is functioning fine without it. Me on the other hand.
ICANHITHIMMAN
02-25-12, 20:33
i have a bad lever on my mrp, but i had to clearance the back of the lever, otherwise it would contact the upper, lifting the bolt stop/release,
you might have your bolt release dragging on the underside of your carrier, slowing it down, and failing to strip a round out of the mag.
remove lever and try again. you can fix this by taking a dremel and taking a small of material off the back of the lever.
did you read the thread?
Mauser KAR98K
02-26-12, 02:04
hell no, haha
Yeah...problem has b'en fixed; strangely, it was what you just said, just a day late and a dollar short. But I hear 'ya.
Lets have this thread be part of the search data base. Problem solved.
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