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WE "Open Bolt System" Complete Conversion Kit for WE M4 Airsoft GBB Rifle

ID: 37349 (Kit-WE-OB-M4)
4.5 stars, based on 2 reviews
WE Open Bolt System Complete Conversion Kit for WE M4 Airsoft GBB Rifle
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The WE Open Bolt M4 Kit will allow you to convert your old AWSS M4 (Brass Bolt System) into the new realistic Open Bolt system. The kit includes a completely assembled Inner Barrel with Hopup Assembly (inner barrel, hopup bucking, hopup shell), a complete Bolt Assembly (bolt housing, nozzle assembly), Complete Trigger Group, magazine lip/seal conversion set (follower, mag seal, mag lip), and other small parts necessary for the conversion.
The Open Bolt system combines reliability, realism, and easy maintenance to create a new high standard for Quality Gas Blowback Rifles. These and many more WE parts are available at factory direct pricing only at

Need to convert your old mags? Click here for the Open Bolt mag lip set.

Materials: Aluminum, High Impact Polymer, Steel
Package Includes: Inner Barrel w/ Hopup Assembly, Complete Bolt Assembly, Magazine Conversion Set, Trigger Group, Dust Cover, Bolt Catch, Pin Punch Tool
Manufacturer: WE


WE is one of the world's premiere Airsoft manufacturers, designing and creating some of the best Airsoft products in the world. Exclusively distributed by in the USA, we offer unmatched after-sales support, full parts support, and gun servicing.

2 Customer Reviews

(Write a review)

by christain V. on 08/01/2020
"I bought this kit to replace the work out and broken pieces of my current M4. Not only do the parts fit flawlessly, the gun runs even better than i have ever seen from it. The weapon cycles smoothly and shot placement is consistent from about 500 feet away using .25 grams. This conversion kit is perfect for those looking to upgrade their old guns or as a replacement parts kit for the newer version.
by Kevin P. on 12/02/2012
"Overall, i gitve this a 4/5. All the parts work very well, and i recommend you watch ideos on youtube before trying to install by yourself (unless you take it in to a sotre and have them convert it for you). The installation was easier that way and everything was fine. Very poleased with this, but there is one issue: the bolt catch piece does not catch when the mag is empty. Unlike the AWSS version, this piece comes shave off a bit more so that it never meets with the bolt, so there will be dry firing issues and you might waste some gas.

-Easy installation, once you know what your diong
-All the parts (exept one) work after install

-Bolt catch does not "catch"

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