M4 BBs not feeding, unless mag held in (update mar 15, resolved)

Mirodasc · January 30th, 2011, 19:29

Recently acquired an M4, D-boys body, G&P Mechbox, not sure on hop-up.

The problem is when I shoot it, the magazine doesn't fully engage with the hop-up when in a resting position, but if I press up or forwards on the magazine, it engages.
Not sure on magazine brand, but is there anything I can do to make the hop-up chamber sit lower?
As far as I can figure out no due to it sitting up against the gearbox and being held in place by the upper receiver.

Any help would be greatly appreciated! Thanks!

R.I.T.Z · January 30th, 2011, 19:32

velcro on the back of the magwell, try it

AngelusNex · January 30th, 2011, 19:35

Quote:

Originally Posted by R.I.T.Z

velcro on the back of the magwell, try it

This, or some sort of 1/8 inch foam tape, pretty much anything to wedge the mag forwards. if there are still failures to feed then you may need to replace your hopup. (had to do this with my friends heavily abused CA M4, not sure exactly what was up but it was the last thing i could think of causing the feed failures and after replacing it the gun was fine)

Mirodasc · March 11th, 2011, 01:12

Alright, so I finally got around to finding some Velcro and it's still not working.
Can anyone recommend a long hop-up for me?

Styrak · March 11th, 2011, 01:18

Have you tried trimming the BB retention wedges in your mags?

phloudernow · March 11th, 2011, 09:37

try another magazine brand, Ironicly King arms high cap magazines dont feed in a stock King arms gun kidna wierd especially since the gun comes with the mag but happens, works fine with CA Midcaps tho, if not try resetting the gearbox position, one of my guns had issues with magazine feeding because the hopup and gearbox wasnt aligned properly after taking it to the gun doc and tuning it up with a new piston and reshimming the gears it was taking in mags perfectly

m102404 · March 11th, 2011, 10:19

It litterally doesn't take much on some setups to get it to feed/misfeed. Something as simple as overtightening the stock screw can pull the mechbox and other bits out of alignment.

Since the mag is held "stationary" in the lower receiver and the hopup is in the upper receiver those two parts can be out of spec. Add in variations with brands of hopups...and mags...and mag catches and any tolerance variations can stack up and result in less than ideal functioning.

1. You've narrowed down on what part needs to interact with the other for propper feeding of BBs up into the hopup...the tip of the feed tube needs to insert into the mag enough to set the BBs free so they can be sprung up into the hopup...and then be fire, etc...

You can try to address issue a couple of ways and certainly a list of things to check:
1. See that your mags are seating high enough....take the mag catch out and hold the mag up until the top of the cutout in the side of the mag matches up with the top of the slot for the mag catch. If it feeds like that then look to see if the top of the mag catch is actually high enough and doesn't have a lot of up and down play....several are undersized and have enough play to allow the mag to move up and down.

2. Insert a full mag up all the way...hold it up and shoot. If it feeds properly....then let it go...does it stop spitting out BBs after the next shot? If that's the case then the mag is riding too LOW (not forward or backwards). How much do you need to push it up (gradually) until you hear the BBs release and it starts shooting again (you can hear the BBs feed if you do it slowly/carefully enough). If it's just a little...then I'd suggest you shave the retaining catch on all your mags (note some mags have really long retaining catches...KA is notorious for it....others don't). Just remove enough to so that the mags continue to feed even if you're pulling down on them.

So...all it might take is a reassembly and not overtightening things. If you've got a lot of up/down play in the mag catch, try another one (nothing might work if you've got a lousy Dboys body). You might need to trim the BB catch (there's pictures and other threads on that...search for King Arms M4 mags not feeding or something like that)

Best of luck.

Mirodasc · March 15th, 2011, 05:10

So, the gent I bought it from included a spare magazine catch.
I tried installing it a while ago, but it wouldn't catch on the magazines at all, so I put the old one back in.
I tried it out for the sake of trying it, and it works.
So just a worn down mag catch!

Thanks for the help guys.

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January 30th, 2011, 19:29	#1
Mirodasc Trader rating Join Date: May 2006 Location: Vancouver BC	M4 BBs not feeding, unless mag held in (update mar 15, resolved) Recently acquired an M4, D-boys body, G&P Mechbox, not sure on hop-up. The problem is when I shoot it, the magazine doesn't fully engage with the hop-up when in a resting position, but if I press up or forwards on the magazine, it engages. Not sure on magazine brand, but is there anything I can do to make the hop-up chamber sit lower? As far as I can figure out no due to it sitting up against the gearbox and being held in place by the upper receiver. Any help would be greatly appreciated! Thanks! Last edited by Mirodasc; March 15th, 2011 at 05:09..

March 11th, 2011, 01:18	#5
Styrak Trader rating Join Date: Jan 2007 Location: Saskatoon, SK	Have you tried trimming the BB retention wedges in your mags? __________________ Airsoft Sales and Repair/Upgrade Services

March 11th, 2011, 09:37	#6
phloudernow Trader rating Join Date: Nov 2010 Location: Toronto - Ontario, Vancouver - B.C and Hong Kong	try another magazine brand, Ironicly King arms high cap magazines dont feed in a stock King arms gun kidna wierd especially since the gun comes with the mag but happens, works fine with CA Midcaps tho, if not try resetting the gearbox position, one of my guns had issues with magazine feeding because the hopup and gearbox wasnt aligned properly after taking it to the gun doc and tuning it up with a new piston and reshimming the gears it was taking in mags perfectly __________________ Current Lineup: VFC HK416 Custom Custom Bowie Tactical x SAI Glock 17 (TM Base), Custom SAI BLU Glock Build (Timberwolf Base) Custom Zev Noveske Shooting Team Glock 34 Project Guns Custom Zev Dragonfly G17 (Project) (In progress)

January 30th, 2011, 19:32	#2
R.I.T.Z Crackers Trader rating Join Date: Mar 2009 Location: The Shwa	velcro on the back of the magwell, try it

March 11th, 2011, 01:12	#4
Mirodasc Trader rating Join Date: May 2006 Location: Vancouver BC	Alright, so I finally got around to finding some Velcro and it's still not working. Can anyone recommend a long hop-up for me?

March 11th, 2011, 10:19	#7
m102404 Tys Trader rating Join Date: Apr 2006 Location: Toronto	It litterally doesn't take much on some setups to get it to feed/misfeed. Something as simple as overtightening the stock screw can pull the mechbox and other bits out of alignment. Since the mag is held "stationary" in the lower receiver and the hopup is in the upper receiver those two parts can be out of spec. Add in variations with brands of hopups...and mags...and mag catches and any tolerance variations can stack up and result in less than ideal functioning. 1. You've narrowed down on what part needs to interact with the other for propper feeding of BBs up into the hopup...the tip of the feed tube needs to insert into the mag enough to set the BBs free so they can be sprung up into the hopup...and then be fire, etc... You can try to address issue a couple of ways and certainly a list of things to check: 1. See that your mags are seating high enough....take the mag catch out and hold the mag up until the top of the cutout in the side of the mag matches up with the top of the slot for the mag catch. If it feeds like that then look to see if the top of the mag catch is actually high enough and doesn't have a lot of up and down play....several are undersized and have enough play to allow the mag to move up and down. 2. Insert a full mag up all the way...hold it up and shoot. If it feeds properly....then let it go...does it stop spitting out BBs after the next shot? If that's the case then the mag is riding too LOW (not forward or backwards). How much do you need to push it up (gradually) until you hear the BBs release and it starts shooting again (you can hear the BBs feed if you do it slowly/carefully enough). If it's just a little...then I'd suggest you shave the retaining catch on all your mags (note some mags have really long retaining catches...KA is notorious for it....others don't). Just remove enough to so that the mags continue to feed even if you're pulling down on them. So...all it might take is a reassembly and not overtightening things. If you've got a lot of up/down play in the mag catch, try another one (nothing might work if you've got a lousy Dboys body). You might need to trim the BB catch (there's pictures and other threads on that...search for King Arms M4 mags not feeding or something like that) Best of luck.

March 15th, 2011, 05:10	#8
Mirodasc Trader rating Join Date: May 2006 Location: Vancouver BC	So, the gent I bought it from included a spare magazine catch. I tried installing it a while ago, but it wouldn't catch on the magazines at all, so I put the old one back in. I tried it out for the sake of trying it, and it works. So just a worn down mag catch! Thanks for the help guys.

M4 BBs not feeding, unless mag held in (update mar 15, resolved)

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