G&P M4 GBBR - Needs to cock everytime

Thanh · January 13th, 2011, 16:37

so i finally got my new bolt carrier in and my prowin mags. everything is good for the last couple of days. now suddenly the gun can not fire full auto, infact it needs to be cocked every time i want to fire. what can be the problem?

edit:
okay, seems to be the bolt carrier. i got a VLTor 5KU bolt carrier with a ra tech drop in nozzel. I notice the bolt carrier also seems to be a bit too long and the nozzel o-ring is very tighly fitted.

ILLusion · January 13th, 2011, 17:18

Check the o-ring. Many times, the o-ring that comes with the nozzle are too tight. I also have RA-Tech o-rings that are a bit smaller.

Was the bolt carrier you group made specifically for the G&P receiver?

Thanh · January 13th, 2011, 17:35

problem fixed. shaved o-ring down and it worked.

as for grouping its wa spec. is that not the same as g&p?

ILLusion · January 13th, 2011, 18:04

Quote:

Originally Posted by Thanh

as for grouping its wa spec. is that not the same as g&p?

It's not the same. Different length.

Gunny_McSmith · January 14th, 2011, 01:15

Go to home depot, with your bolt carrier, and test orings.... :P

ILLusion · January 14th, 2011, 13:45

Yeah, I'd personally avoid "shaving" o-rings. I'm not sure what your method was, but I'm picturing an Xacto knife and using your hand. That's not exactly a precision setup for a part that needs more precise fitment as the sole source of a solid air seal. Your gas consumption would probably improve with an appropriate fitting o-ring.

I'd also avoid bringing a bolt carrier group to Home Depot, but that's just me. At the most, I would only bring the piston head, as it's fairly innocuous on its own.

Dynamo · January 14th, 2011, 14:19

you can get a standard size oring from LOWES or Home hardware. it's like 2 thou smaller then the bore of the carrier. all you need to do is cut a long thin piece of paper and wrap it around the oring slot. you can test different lengths until you get the perfect fit.

them RA-Tech orings are garbage, way too large and soft. using a silicon oring in a silicon oil rich environment.. not the smartest of ideas. standard orings are Viton and do not absorb or react with silicon oil, or much of anything else.

Gunny_McSmith · January 14th, 2011, 14:37

I brought mine to Home depot, and was testing orings.... ppl didnt understand what it was...lol

For the general public, they ahv eno clue what a bolt it.... for them to ID a gun, or a part of a gun, they need to see a trigger, stock, barrel, mag.....

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January 13th, 2011, 16:37	#1
Thanh AKA Tsquared Trader rating Join Date: Feb 2004 Location: Toronto	G&P M4 GBBR - Needs to cock everytime so i finally got my new bolt carrier in and my prowin mags. everything is good for the last couple of days. now suddenly the gun can not fire full auto, infact it needs to be cocked every time i want to fire. what can be the problem? edit: okay, seems to be the bolt carrier. i got a VLTor 5KU bolt carrier with a ra tech drop in nozzel. I notice the bolt carrier also seems to be a bit too long and the nozzel o-ring is very tighly fitted. Last edited by Thanh; January 13th, 2011 at 16:40..

January 13th, 2011, 17:18	#2
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	Check the o-ring. Many times, the o-ring that comes with the nozzle are too tight. I also have RA-Tech o-rings that are a bit smaller. Was the bolt carrier you group made specifically for the G&P receiver? __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

January 14th, 2011, 01:15	#5
Gunny_McSmith a.k.a. Palucol Trader rating Join Date: Mar 2008 Location: MTL	Go to home depot, with your bolt carrier, and test orings.... :P __________________

January 13th, 2011, 17:35	#3
Thanh AKA Tsquared Trader rating Join Date: Feb 2004 Location: Toronto	problem fixed. shaved o-ring down and it worked. as for grouping its wa spec. is that not the same as g&p?

January 14th, 2011, 13:45	#6
ILLusion GBB Whisperer Trader rating Join Date: Jun 2002 Location: Toronto	Yeah, I'd personally avoid "shaving" o-rings. I'm not sure what your method was, but I'm picturing an Xacto knife and using your hand. That's not exactly a precision setup for a part that needs more precise fitment as the sole source of a solid air seal. Your gas consumption would probably improve with an appropriate fitting o-ring. I'd also avoid bringing a bolt carrier group to Home Depot, but that's just me. At the most, I would only bring the piston head, as it's fairly innocuous on its own. __________________ *Advanced Airsoft Armaments and Enhancements* Quick to the gun, sure of your grip. Quick to the threat, sure of your shot. Diligentia, Vis, Celeritas Accuracy, Power, Speed

January 14th, 2011, 14:19	#7
Dynamo Harvester of Noobs' Sorrow Trader rating Join Date: Oct 2003 Location: T̆͒ͥ̓̿̅̈́̐͊̿͗̐̾̃͐ͧ&#8	you can get a standard size oring from LOWES or Home hardware. it's like 2 thou smaller then the bore of the carrier. all you need to do is cut a long thin piece of paper and wrap it around the oring slot. you can test different lengths until you get the perfect fit. them RA-Tech orings are garbage, way too large and soft. using a silicon oring in a silicon oil rich environment.. not the smartest of ideas. standard orings are Viton and do not absorb or react with silicon oil, or much of anything else. __________________ Weapons Technician / Gunsmith Don't look at me, I don't know, lol ¯\(°_o)/¯.

January 14th, 2011, 14:37	#8
Gunny_McSmith a.k.a. Palucol Trader rating Join Date: Mar 2008 Location: MTL	I brought mine to Home depot, and was testing orings.... ppl didnt understand what it was...lol For the general public, they ahv eno clue what a bolt it.... for them to ID a gun, or a part of a gun, they need to see a trigger, stock, barrel, mag..... __________________

G&P M4 GBBR - Needs to cock everytime

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