Wednesday, April 26, 2017

G&P GBBR M4 Magpul Style Magazine Fix

Ok, so after painting a few mags and then my friend complaining that at first two didn't seal when he gave them to me but now all of them leak.  We worked a deal where I would trouble shoot it.  Looks like I'm the all around commissioned creative handy man!  But after having one explode in my face by just gently flexing it to see if the leak would stop... I wasnt going to let it best me.  Long story short, for the cost of a tube of silicone (8usd / tube), a slightly larger Oring (1-1/16 x 7/8 x 3/32 #17 O-ring) (50c ea), and a helicoil (~1usd ea) you can effectively fix these not quite perfectly designed leaky mags and make them pretty darned robust. 

But the steps are a bit long so see the following file for the fix.

Leaky Airsoft G&p GBBR M4 Magpul Magazine Upgrade Guide

Dont forget to wear safety goggles! Im serious. One exploded on me.

Also, if you balk at the cost of a helicoil kit (I borrowed mine and bought replacement coils from ebay for a few dollars) you can pretty much make your own if you can get the right tap and a long sacrificial threaded rod for insertion.  Then you just have to buy replacement coils. =)

Further side note, dont tap pot metal to hold a seal on a pressurized canister that gets abused... its just a bad fundamental design and possibly life choice.

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