Description
S&T M4 CQB Gas Blowback Rifle (Polymer – RIS CQB – STGBB06BK)
The S&T M4 CQB is a short, handy gas blowback rifle with an RIS rail handguard, built in polymer to keep the weight down. Every shot cycles the bolt carrier with gas from the magazine, giving you real felt recoil and a satisfying mechanical sound in a rifle sized for buildings and close terrain.
S&T is known for making realistic replicas at approachable prices, and this polymer M4 CQB (code STGBB06BK) is a sensible way into gas blowback for players who want the experience without the weight or cost of a full metal rifle. We also list the same model in a full metal version (STGBB06BKM) and in blue.
Built for close quarters
The CQB-length barrel and short RIS handguard make the rifle quick to bring up, swing round corners and carry through doorways. The polymer body keeps the weight low, which helps when you are moving fast or holding the rifle up for long periods in a building or on a CQB site.
The RIS handguard gives standard 20mm rails around the front end for a torch, laser, vertical grip or hand stop, and the top rail takes a red dot or holographic sight. The controls follow the familiar M4 layout, so anyone who has used an AR-pattern replica will feel at home.
How gas blowback works
Each magazine holds its own gas. Pulling the trigger releases gas to fire the BB and drive the bolt carrier back, which cocks the rifle and gives the recoil impulse. With no battery or motor, the rifle loads, reloads and handles much like a real one.
Gas performance is affected by temperature, so the rifle shoots best in mild to warm weather. On cold days, keep spare magazines warm and allow a moment between bursts so the gas can recover.
Key features
- S&T M4 CQB gas blowback rifle
- Polymer body for lower weight (STGBB06BK)
- RIS rail handguard for accessories
- Short CQB barrel length
- Working blowback with felt recoil
- Familiar M4 controls
- No battery required
Compatibility
Gas blowback magazines are specific to the rifle system and are not interchangeable with AEG magazines; magazines from different makers do not always fit or seal correctly. Please buy spare magazines listed for this S&T rifle or its exact system, or ask us before ordering.
The RIS handguard takes standard 20mm accessories, and external M4/AR-pattern accessories such as optics, lights, grips and slings fit in the usual way. If you are unsure whether a particular part or upgrade suits this S&T system, contact us with the model code before ordering.
Care and maintenance
Use the gas recommended in the manual and fill magazines in short bursts without overfilling. A drop of silicone oil on the magazine fill valve and seals now and then keeps them supple, and magazines are best stored with a little gas in them so the seals stay seated. Gas performance drops in cold weather, so keep spare magazines warm in a pouch or pocket on chilly days.
Gas blowback rifles have more moving parts than electric replicas, so keep the bolt carrier and nozzle lightly lubricated with a suitable silicone product and wipe away grit after each game. Run a cleaning rod through the inner barrel occasionally, use clean seamless BBs only, and store the rifle unloaded somewhere cool and dry.
Who is it for?
The S&T M4 CQB polymer GBB is for CQB and indoor players who want a light, short rifle with real blowback, and for players moving from AEGs to gas who want an affordable first GBB rifle.
Please note: Gas and BBs are not listed as included. Always wear suitable eye protection, and full-face protection where your site requires it, when using or testing any airsoft replica.
