If you haven't had enough of the M4, we're giving you even more options to build an even more custom airsoft gun. This new option lets you choose from our selection of M27-style lower receivers. You can also easily drop in newly added uppers with rail systems -- including the coveted KeyMod handguard!

Customize your own DMR. Add your favorite scopes and foregrips for the perfect shot with our industry first Airsoft Gun Builder

Let Airsoft Megastore's experienced technicians assemble your custom built airsoft gun, ensuring that all components are properly installed and the gun performs at expected levels.

Lancer Tactical Gen 2 M4 SD Carbine Airsoft AEG Rifle with Red Accents - (Black) SKU: LT-15B-G2-RED-K

Atlas Custom Work's CQB-ready M4 offers a side-folding stock, ergonomically shaped motor grip and textured handguard that allows your AEG to snap to your movement.

In the Box Atlas Custom Works M4 RIS Carbine 300rd hi-cap magazine a vertical fore grip 2 x rail covers and cleaning rod

Complete with flip-up iron sights, a 120-round magazine, and assembled in the USA, the Lancer Tactical Full Metal Legion HPA M4 SPR Interceptor is a must-have for airsoft enthusiasts seeking unrivaled performance. Visit Airsoft Megastore now to …

The Stubby Carbine length Outer Barrel is manufactured Atlas Custom Works and constructed with a one-piece metal build making it a solid option for CQB enthusiasts.

Introducing the Lancer Tactical Full Metal Legion HPA KeyMod M4 Carbine Airsoft Rifle, available now on Airsoft Megastore! This powerhouse of a weapon boasts a mechanical pneumatic HPA engine, guaranteeing consistent airflow without the need for batteries.

Atlas Custom Works 10" Inch M4 Carbine Outer Barrel for Airsoft AEGs (Color: Black) SKU: ACW-123