Thread: Agm m4 gbbr
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Old September 10th, 2009, 17:19   #1
Official Crybaby Chairsofter
Join Date: Jun 2007
Location: Montreal, QC
Agm m4 gbbr

Some of the information on this thread is from third party sources while other is from personal research.

I will add more to this thread as i find new things (still a LOT of parts coming in to try).

AATV Youtube Review:
YouTube - AATV Video Review: AGM M4 Gas Blowback

GasGuns.Info Review:

Known Problems:
Weak nozzle. Breaks after a couple hundred rounds.
Magazines (1st Gen) usually leak gas.
Weak hop up unit. Breaks after a couple hundred rounds.
Bolt catch is fiddly (some work, other don't work, especially 1st gen).
~400fps out of box, not gamable in most Canadian fields.

Multiple companies offer aftermarket parts for the AGM to make it a more reliable platform to game. Every month we see new companies/parts poping out on the market. Sources say the Chinese cloners are currently working on parts for a cheaper solution than Ra-Tech or G&P.

Bolt Carriers:
The first thing to look at is the bolt carrier. Ra-Tech offers different solutions to make the AGM more gamable. Any of the options bellow will let you adjust the FPS of your AGM to make it gamable.


RAG-AGM--001 (NPAS Tool Set) $60USD

RAG-WA-bolt014 (Complete bolt solution, silver) $260USD

RAG-WA-bolt-015 (Complete bolt solution, dim grey) $260USD

G&P has just came out with a NPAS style bolt carrier. It has not been tested AFAIK.

RedWolfCustoms also make a 'light' bolt carrier ($105-$115USD). Be warned it needs to be sanded/dremeled to work properly (toward the end of the bolt, its oblivious if you shoot it a couple times). Because of that, i do not recommend it as a drop in.

RWC Silver Bolt Carrier:
RWC Matte Silver Bolt Carrier:
RWC Black Bolt Carrier:

You will need a nozzle:
Pro-Arms Hi-Power Loading Nozzle

Hop Up/Tightbore:
The hop up is very weak, if a double feed occurs it will usually break the hop up or the nozle. G&P, Prime and Pro-Arms have you covered.


#1 G&P WA Hop Up + Tightbore (Any 1 of those) $67USD

#2 Prime Hop Up (You will need a tightbore) $74USD
Hop Up that takes any AEG tightbore
Hope Up that takes WA tightbore

Pro-Arms Adjustable Hop Unit
+Guarder Hard Type Hop Bucking
+KM 6.04mm TN barrel for M4

Buffer + Buffer Spring
The AGM buffer/buffer spring is weak and isn't as smooth as it should. G&P and Ra-Tech have made drop in replacement.

G&P offers a couple different kits that are drop in and offer different recoil strength. Any of those fit drop in and work much better (even under water!).

G&P Silver Buffer + Buffer Spring (HHR) 'heavy recoil' $16USD
G&P Black Buffer + Buffer Spring 'normal recoil $16USD

Ra-Tech has their own WA style buffer/buffer spring, its a drop in:
RAG-WA-stock-001 'Summer' $10USD

RAG-WA-stock-002 'Winter' $10USD

*Lower (G&P Anti-Rotation Links, G&P Steel Bolt Catch)
*RAS/RIS Compability
*Dimensions (flash hider threading, stock tube, threading sizes/direction, etc)
Originally Posted by Mr.Shiney View Post
Yes it is hard to find an Instructor that teaches how to Finger, Suck, Squeeze and Blow all at the same time.

Last edited by Ronan; September 12th, 2009 at 22:43..
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