M4 takedown issue

HaggardsSoap

Hi guys

I have an issue with my M4A1. When I take it apart I have to use a screwdriver to push it forward and slide the upper receiver off and when I try to put it back on it sometimes doesn't go all the way in and I sometimes have to spend countless hours trying to get it in with force. Id like to know if there is a way around it and Im not a big fan of sliding receivers since I have owned a ICS M4 for a long time (until it meet its horrifying external destruction).


If some of you want to know the brand of my gun then its made by LONEX.

Inari

Each rifle has its own little intracicies when working on them. That said I have never had to pry a receiver off with a screwdriver. Can you isolate the area that is binding on you (i.e. Where are you feeling the resistance)? A lot of M4 V2 gearboxes have a lug on the top which requires you to simply pull back the charging handle in order to clear it. Does your gearbox have that small raised portion?

HaggardsSoap

Inari wrote: »

Each rifle has its own little intracicies when working on them. That said I have never had to pry a receiver off with a screwdriver. Can you isolate the area that is binding on you (i.e. Where are you feeling the resistance)? A lot of M4 V2 gearboxes have a lug on the top which requires you to simply pull back the charging handle in order to clear it. Does your gearbox have that small raised portion?

It has a lug. The resistance is located at the starting point but once I get that open with a screwdriver it slides off like a charm but when I have to put it back on its a 70/30 if it does not go all the way or it does go all the way in.

I also checked if the front pin well (if thats what its called) and it did not cause any kind of resistance.

Southern Dandy

Fire a few shots on semi to de-cock the spring?, my receiver would not budge until this was done. Worth a punt.

Inari

Hmm, so it's literally just resistance as you're separating the receivers?

If you really want to find out exactly where it's binding, one of the best things you can do is strip it right down removing the gearbox, and seeing if there is any resistance between the two portions of the receiver. It could be that they are just a very tight fit, in which case if you are so inclined you could file them a little to have a looser fit.

If without the gearbox they slide together and apart with ease, then it's to do with how the gearbox is seated - it may be riding a little high, applying greater pressure to the receiver. This is the most likely culprit. If this is the case, you simply remove the stock tube and pistol grip, and if it still won't budge you can remove the pins holding the gearbox in. It isn't often that I've come across that, and generally it would be in guns with ancillary features such as fire-select indicators, functioning forward assist buttons etc.

Kashkai

On a similar note, the G&G M4 I bought (in hobbyairsoft) is a b1tch to take apart. It needs a lot of force to get the receiver off and putting it back together is hard work to say the least. I've seen others take their guns apart in seconds but mine likes to stay in one piece

I haven't attempted to take it apart since the last try as I'm sure it shouldn't be that stiff???? Plus I don't want to risk breaking anything on it by continually using excess force when prying it apart and putting it back together.

Apart from that, it's a great gun, very accurate and reliable

T4RGET

I've usually found G&G's metal bodies to be more difficult to take apart then their polymer versions. My raider is so easy to separate, pop the front pin out and the receiver literally slides off. I've had a few G&G's in especially in the last couple of months more so than any other brand and in general their receiver aren't any more difficult to get apart. It definitely sounds like the fake bolt on the inside of the top receiver may be cauisng it though, there's not much there to cause that much friction but a tight upper receiver or like Kev said the gearbox is seated wrong. but I'm pretty sure if that was the case you wouldn't be able to get any of the pins in and the grip wouldn't go on properly as the gearbox would not line up with the screw holes fort he pistol grip correctly

HaggardsSoap

Alright I have found the location of the issue. The rear part of the M4 when taken apart *slide style* doesnt slide in place ith no force or little ammount. It gets in but it wont go all the way in. Whats funny is my thought on the left side of the front takedown pin not being aligned when the receiver is almost in since I can push the pin from the right in.

Any ideas on what should I mod. ?

T4RGET

HaggardsSoap wrote: »

Alright I have found the location of the issue. The rear part of the M4 when taken apart *slide style* doesnt slide in place ith no force or little ammount. It gets in but it wont go all the way in. Whats funny is my thought on the left side of the front takedown pin not being aligned when the receiver is almost in since I can push the pin from the right in.

Any ideas on what should I mod. ?

so you can place the top receiver infront of the gearbox and slide it over, but then it gets stuck as it gets to the back of the gearbox? Do I understand correctly?

HaggardsSoap

Just noticed something when putting the 2 receivers together.
When the 2 receivers are pushed in, the front receiver pin will go in threw the right side and threw the upper receivers hole but it wont go in due to the left side of the lower receiver. Now Im having a hard time figurign out if the upper receivers left side wont budge in properly or theres something funky about the lower being bent.

This issue makes me sad since most M4s I have taken apart with the slide style come apart and go back together so easily yet this is the first M4 with a takedown issue.

Inari

Pictures? At this stage it's very difficult to isolate and identify issues.

As I said before; every single M4 that I have ever worked on has had its own intricacies - some are very loose and rattle about, some are very tight and need some persuasion, and you have everything in between from different screws used, to knurled pin-lengths, bolt catches etc.

Personally I prefer a tight fit - less rattle. But, if it bothers you, while you have the receiver on its own simply have a look and see where it is binding, and then file away at that part to give it more clearance room. You're looking to thin it out so that you have a little more space to work with.

As for the pin not going in all of the way, remember to always push the pins in to the side as you're tapping it in, instead of straight down. It helps with the alignment. Gentle, but firm. Sometimes you can end up babying the guns too much, where you just need to tap it a little harder. I'm not saying "WHACK IT WITH A HAMMER TIL IT FITS" but rather not to be too afraid