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Delta ring issue


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#1 kwaispro727

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Posted 16 December 2013 - 01:59 PM

So I just got my LM4 today.  Super happy with it.  It kicks a little harder than I expected.  People who own the LM4 and the G&P WOC have told me the G&P recoils harder, but I have to say, the LM4's recoil definitely isn't light.  The gun itself is also lighter than I expected lol.  I forgot how light a bone stock M4 carbine is, since I've been running an SR10 with a moderately heavy scope.

One issue, and I'm sure it's a simple one, but I cannot get the damn delta ring to move back more than a millimeter or so.  I thought I read something about this on here but I can't seem to find it again.

Just a heads up, I can't fiddle with it until Christmas.  The parental units are determined to wrap something for me for Christmas this year.  It's technically for Christmas, even though I bought it early myself lol this happens like every year.  I only opened it to make sure everything was working :P

#2 gcw360

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Posted 16 December 2013 - 03:18 PM

View Postkwaispro727, on 16 December 2013 - 01:59 PM, said:

So I just got my LM4 today.  Super happy with it.  It kicks a little harder than I expected.  People who own the LM4 and the G&P WOC have told me the G&P recoils harder, but I have to say, the LM4's recoil definitely isn't light.  The gun itself is also lighter than I expected lol.  I forgot how light a bone stock M4 carbine is, since I've been running an SR10 with a moderately heavy scope.

One issue, and I'm sure it's a simple one, but I cannot get the damn delta ring to move back more than a millimeter or so.  I thought I read something about this on here but I can't seem to find it again.

Just a heads up, I can't fiddle with it until Christmas.  The parental units are determined to wrap something for me for Christmas this year.  It's technically for Christmas, even though I bought it early myself lol this happens like every year.  I only opened it to make sure everything was working :P
Congratulations, pull, or push, down harder.  Ideally with a forend tool.

#3 Chuck S

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Posted 17 December 2013 - 03:50 AM

There's "no user serviceable parts" under the handguards so no reason to remove them.  Certainly not before Christmas.  The LM4 handguard slip ring (delta ring) is almost as hard to retract as the ring on service rifles and is often a two-man job or requires the use of a handguard removal tool.  About $15.

Posted Image

-- Chuck

#4 kwaispro727

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Posted 17 December 2013 - 07:33 AM

Ah ok great, thanks.  I actually have all the parts that I would like to customize it with so I'm excited to get the handguard off next week :P  I have two other questions.  Can the sling mount be removed?  And, is there a way to get the recoil spring to stop rattling?

#5 gcw360

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Posted 17 December 2013 - 09:54 AM

View Postkwaispro727, on 17 December 2013 - 07:33 AM, said:

Ah ok great, thanks.  I actually have all the parts that I would like to customize it with so I'm excited to get the handguard off next week :P  I have two other questions.  Can the sling mount be removed?  And, is there a way to get the recoil spring to stop rattling?
After the 45 day warranty period...ask again! :innocent:

#6 Felipe_PFL

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Posted 17 December 2013 - 12:42 PM

Get a hand guard removal tool. I got mine from a local gun shop for $10ish

#7 Chuck S

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Posted 17 December 2013 - 04:36 PM

Yep, let the warranty run its course before diddling the gun.  That's 45 days from the purchase date.

The sling swivel should be held on by two roll (split) pins.  Just press them out.

Not sure what you mean by the recoil spring rattling.  Mine sure doesn't.  Remember this is marketed as a Professional Training Rifle and mimics the M4 Carbine very closely.   Hearing the recoil spring when shooting is normal and how the real M4 works.  Shoot either one enough and you'll be able to tell how well the gun is firing.  Strange noise often indicates a problem.

-- Chuck

#8 kwaispro727

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Posted 18 December 2013 - 08:15 AM

I was referring to rear sling mount so I could get a FAB grip on there more easily but I guess I'll just file the grip down instead.  

I learned a trick from a friend that instead of buying a tool, if you take a pair of pliers with rubber grips and squeeze like with the tool, you have enough leverage on both sides to easily push down.  

I don't remember hearing the spring last time I shot an AR.  At least, it was definitely not as prominent if it was there as my LM4. I will see if I can get a video to pick up the rattling of the spring next week.

I also noticed my mag leaking very slightly from the charging valve on the bottom.  Is there a way to tighten it or something?  On my MP7 and M9 when this happened I shot the rest of the gas out of the magazine, dropped some silicone on the valve, and filled it again and that seemed to correct the problem, but not on the LM4 mag.  I already checked out the release valve and learned how to correct it, but that doesn't seem to be the issue here.  Maybe I need to change the O-ring? I have some moondog rings I could swap in.

#9 netpoc

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Posted 18 December 2013 - 01:21 PM

Check here for a video by Akira that addresses the buffer spring noise. It is an easy fix. Just simply make a few of the coils on the spring slightly larger.

#10 kwaispro727

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Posted 18 December 2013 - 01:32 PM

View Postnetpoc, on 18 December 2013 - 01:21 PM, said:

Check here for a video by Akira that addresses the buffer spring noise. It is an easy fix. Just simply make a few of the coils on the spring slightly larger.
No link?

#11 Lost

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Posted 18 December 2013 - 01:52 PM

I think Akiraspeedstar took down his channel. So no link I believe.

#12 Chuck S

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Posted 18 December 2013 - 03:39 PM

The rear sling mount should come off by unscrewing the screw at the toe of the stock.

Welcome to the world of GBB O-rings.  The LM4 magazines need some preventive maintenance.  The STANAG magazines seem to leak less than the MagPul.  And are cheaper.

-- Chuck

#13 kwaispro727

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Posted 18 December 2013 - 03:43 PM

What do you recommend doing to them?

#14 gcw360

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Posted 18 December 2013 - 06:00 PM

View Postkwaispro727, on 18 December 2013 - 03:43 PM, said:

What do you recommend doing to them?
For the charging valve, I would simply try tightening it with a valve tool or small screw driver.  Do not over tighten. If it still leaks remove the valve, be sure there is no residue in the threads, put a drop of silicone oil on the o-ring, and reassemble.  That should do the trick!

#15 akiraspeedstar

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Posted 19 December 2013 - 12:47 PM

Rear sling mount
Just remove the castle nut and buffer tube and it'll come right off.

Buffer Spring Noise
All you need to do is uncoil/unwind a few of the center coils of the buffer spring just a little. It prevents the spring from shaking around in the buffer tube when the BCG shoots forward.

While to my understanding real ARs also make that sound, the LM4 obviously doesnt have the same report when firing and that spring sound is annoying haha.

Edited by akiraspeedstar, 19 December 2013 - 12:50 PM.


#16 Chuck S

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Posted 19 December 2013 - 03:42 PM

I could have sworn the rear sling mount was at the toe of the stock.  There's a midpoint mount on the end of the lower receiver.  But there are lots of variations to these guns.

-- Chuck

#17 akiraspeedstar

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Posted 19 December 2013 - 07:08 PM

I believe he's talking about the sling mount at the rear of the receiver as it'd probably interfere with the FAB Defense pistol grip.

#18 Chuck S

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Posted 20 December 2013 - 04:09 AM

Looks like it.  The lower receiver end plate does more than act as a sling attachment point though.

-- Chuck




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