In recent years, various manufacturers have developed AR15 short-stroke kits for GBB AR15 airsoft (e.g., Maple Leaf Hummingbird bolt, Airsoft Monster/GBL short bolt and C&C tac short bolt/SRU S.C.S. BOLT) , allowing AR-15 to be fitted with folding stocks.

However, SRU see another possibility: converting the AR15 into a bullpup rifle.

The biggest advantage of a bullpup rifle is that it significantly shortens the overall length of the firearm while maintaining the same barrel length. This brings the center of gravity closer to the operator, greatly enhancing maneuverability. This advantage is particularly evident in close-quarters combat (CQB).

The advantages of product are as follows:

1. Exceptional Industrial Design and Ergonomics:
   SRU kit seamlessly transforms the AR15 into a bullpup rifle, enhancing its futuristic style. Compared to competitors' kits, SRU professional design far surpasses the amateurish, garage-made feel of theirs.
2. Exclusive Patented Trigger Linkage Design:
   SRU rotary lever design reduces the trigger pull weight, allowing the front trigger to be easily replaced with any AR15-standard trigger available on the market. (The airsoft version uses a 304 stainless steel stamping process.)
3. Versatility: SRU kit is compatible with any AR15-spec trigger, safety selector and grip, significantly increasing customization options.
4. Exclusive Patented Magazine Release Button: Designed for ambidextrous operation, SRU magazine release button offers superior ease of use compared to competitors.
5. High Compatibility:SRU kit is adaptable to most AR15 models, offering broad compatibility, whereas competitors' products only fit specific AR15 configurations.

(This Version Not included Extended Metal Handguard)

[Compatibility]

1. The SARB-15 bullpup chassis kit does not include an AR-15 lower receiver. This kit only supports Mil-Spec style AR-15 lower receivers.
2. The SARB-15 bullpup chassis kit does not include an AR-15 upper receiver. This kit supports upper receivers with AR-15 upper receivers that have a short-stroke BCG installed (e.g., Maple Leaf Hummingbird bolt, Airsoft Monster/GBL short bolt and C&C tac short bolt/SRU S.C.S. BOLT)
3. The SARB-15 bullpup chassis kit does not include a short-stroke BCG. Please contact Maple Leaf, Airsoft Monster/GBL, C&C tac or SRU to purchase GBB short bolt sys.
4. The SARB-15 bullpup chassis trigger linkage system is compatible with single-stage or 2-stage AR-15 trigger sets. However, please note that the trigger must be a curved type and not a flat type.