Gp Sr15 - Help Changing the Stock and Outer Barrel

[THE FNG]

Hi all,

I have a g&p sr15 that I am looking to modify and I need some assistance.

I have never modded anything that falls under the "m4" bracket, so this is a first for me.

What I want to do so swap the outer barrel so that a suppressor sits either flush against the end of the handguard/rail system, rather than further down at the end of the outer barrel that protrudes out of the rail system OR install a suppressor that is integrated underneath the rails. 

I also want to swap the "DMR style" stock for a standard AR style buffer tube so that I can put a crane or similar style stock.

Images below: top is current setup, bottom is what I'm aiming for.

Regarding the stock; I took off the dmr stock and I tried to attach a random m4 stock from my brothers old Asia Electric Gun SR15 (same model, different manufacturer mind) but I noticed that the bit that protrudes at the back of the receiver that guides the stock tube in place was considerably shorter on the g&p than the Asia gun. I screwed in the stock tube but when the screw went in all the way, the tube had around 1 or 2 inches of play, sliding backwards and forwards.

I then tried to install the shorter outer barrel system from the Asia sr15 onto the g&p sr15 but it was slightly too wide to slot into the front of the receiver.

I am now trying to find a stock tube that will fit and an outer barrel that will fit.

The outer barrel I'm after is around 13" I beleive (current stock barrel is 17").

Is there any specific tube or barrel that I need? Will it have to be g&p branded or are there certain compatibility with different brands?

Can anyone assist? 

View attachment 67668

View attachment 67669

 

[PopRocket123]

First things first is the original outer barrel fitting tapered? Most G&Ps have a different fitting to TM spec AEGs as it gives a more solid fitting. However this also means you can only fit g&p barrels. 

As for the buffer tube I ended up spend nearly £40 on a g&p one after trying for ages to find one that fitted. The ones I could find that were the right length were still too loose. This meant that over time they worked themselves loose and chewed up my wiring. 

 

[Lozart]

Is the barrel painted or polished on the receiver end? The polished ones are tapered so a normal "TM spec" one won't fit. There's a fair amount of aftermarket barrels out there for G&P taper though.

 

[THE FNG]

I guess this is untapered?

This would go into the cheap sr15 but the cheap sr15 out barrel would only go a few mm into the g&p sr15.

View attachment 67773

 

[Lozart]

I guess this is untapered?

This would go into the cheap sr15 but the cheap sr15 out barrel would only go a few mm into the g&p sr15.

View attachment 67773

Yeah the taper is pretty obvious 

Seems it's just down to the size then. Bit odd that the cheap one goes in a bit but then stops.

 

[Nicnicol]

Hey how did you get on? I have the same gun and had it for a year and it's been a bag of shit from out of the box... so far I have spent About £200 on upgrades and the last was to fit a madbull chamber but guess what it never fitted the upper chamber without sanding the chamber and then it never fed well lol