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A few questions!

A frame hop up slip ring handguards adjustment removal

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#1 Murray0311

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Posted 21 June 2013 - 11:20 AM

Hey guys, I just got my first LM4 yesterday and I've run into a few snags and have a couple questions for you.

1st off- Hop up wrench broke off a few teeth in the hop unit, so I can't adjust this thing. Is there ANY way to adjust the hop up without using the wrench? My bb's are going about 75-100 feet before they climb a ridiculous amount. It isn't TERRIBLE, just more of an annoyance. I'm not terribly worried about it since at some point in the near future I'm getting the RAT barrel anyways, and I'm pretty sure that comes with a whole new unit.

2nd- How in the hell do you get the A frame off?? My problem is I'm trying to put on a suppressor to cover the inner barrel ( I don't have the C version, but I broke down the barrel to make it carbine length) and the suppressor is blocked by the baynet lug. can the A frame be taken off without having to remove the handguards? Or am I just gonna have the rock the full length until I can get some rails?

3rd, and lastly- This slip ring is damn near impossible to move.....it literally won't budge. at all. help meee. lol

Any help will be greatly appreciated. I wanna take this thing out to game tomorrow and I'd like to have it lookin' fly / shooting straight :D

Edited by Murray0311, 21 June 2013 - 03:09 PM.


#2 Chuck S

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Posted 21 June 2013 - 04:35 PM

The handguard slip ring ("delta ring") is hard to push back.  I have several AR15/M4 carbines and have a handguard tool to help on them.  Helped on the LM4 too.  Often a two person job without the tool.

Beware, the barrel nut is LockTited in place and you will break the multipart upper receiver trying to unscrew the barrel unless you break the glue with high heat.  Several threads on this.

-- Chuck

#3 General Pickle

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Posted 21 June 2013 - 06:42 PM

When you adjust the hop up it's really important to make sure the teeth have a good connection or else that will happen. My delta ring was easy to move, just used some muscle but maybe yours is different. For the barrel nut use a heat gun. Let me rephrase that: USE A HEAT GUN. I spent over an hours hammering on my wrench trying to get mine off but when I did it for my buddie's gun using a heat gun it was a 10 second process. The other threads here explain it all much better than I can in one post. Good luck!

#4 gcw360

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Posted 22 June 2013 - 08:05 AM

Regarding the tower sight, here are the steps.
  • You need to brace the gun in under the tower and also by the front of the upper receiver
  • Next you need to drive out the roll pins with a roll pin punch of the appropriate size, I believe it's a 3/32" but don't hold me to it.  If you use a standard punch you may get the pins out but they will be damaged and I do not recommend reusing them
  • Now slide off the tower with the fake gas tube in place; Note: if you want to remove the tube from the sight, there is another roll pin you will need to remove
Hope this helps

#5 Murray0311

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Posted 23 June 2013 - 10:45 AM

Appreciate the help guys! I ended up just using a dremel to cut off the bayonet lug since that entire A-Frame apparatus is going to come of in the next few weeks anyways.

Took it out for the first day of games and it performed exceedingly well minus my un-adjusted hop-up which proved a bit tough on my accuracy. My RAT barrel comes in this week though so that problem will be gone. Is the hop up unit that comes with the RAT made of plastic as well? I'd hate to break teeth off of that.....

#6 BeachEMT

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Posted 23 June 2013 - 12:06 PM

Both hop-ups are made of metal so you need to be careful. Like others have said you MUST make sure everything is lined up and you apply enough pressure that the wrench stays engaged. ASGI has a video on how to properly adjust the LM4 hop-up.

#7 Murray0311

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Posted 23 June 2013 - 12:22 PM

really? Seemed like it was plastic with how easily those teeth broke off. I'll definitely be more careful next time, and I'll have to check out that video from ASGI...appreciate the advice

#8 General Pickle

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Posted 23 June 2013 - 02:04 PM

I find that it's best to crack the upper/lower apart and then pull the bolt out and adjust it that way. I haven't broken any teeth off yet, just be very careful with it! It's easy to think that the teeth are engaged but in fact they may not be.

#9 Murray0311

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Posted 24 June 2013 - 12:58 PM

Yeah I learned that the hard way unfortunately :blinded:

At least now I know how fragile they are so I'll be damn sure to make sure the teeth are aligned correctly once my RAT barrel/hop comes in.





Also tagged with one or more of these keywords: A frame, hop up, slip ring, handguards, adjustment, removal

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