POTD: The SARB-15 Chassis Meets BRN-180

SRU Precision from Taiwan makes chassis for various firearms, or in their own words, specializes in crafting aesthetically designed and other innovative firearm parts. In this Photo Of The Day, their SARB-15 chassis got a major upgrade, now paired with the BRN-180 upper for a sleek, compact, low-recoil package. According to the company’s description, you get reduced overall length, uncompromised barrel performance, and a bold, futuristic look.
Note that this is a bullpup conversion kit only, not a firearm. It is not a serialized part and does not include any firearms.
SARB-15 AR-15 Bullpup Conversion Chassis specs:
Dimensions:
- Length of Pull (LOP): 15.3”
- Overall Length (OAL) with 16” Barrel AR-15: 26”–29”
- Kit OAL:
- 20” (without handguard)
- 25” (with handguard)
- Weight:
- 980g (without handguard)
- 1320g (with handguard)
Materials:
- Shell: PA66 + Carbon Fiber injection molding
- Trigger Linkage System: 6061 T6 CNC-machined aluminum
- Short Buffer / Sling Mount Endplate: 6061 T6 CNC-machined aluminum
- : Metal-reinforced polymer
- : TPU
- Optional Front Handguard: Stamped steel
AR-15 Compatibility:
- AR-15 Lower Receiver: Mil-Spec only
- AR-15 Upper Receivers:
- Bufferless complete upper (e.g., BRN-180, FM-15, JAKL)
- Mil-Spec upper with short buffer BCG (e.g., DFA MCS 2.5” Buffer, LAW Tactical ARIC, CMMG 5.56 to .22 conversion BCG)
Color Options
- Black
- Tan
- OD Green
It seems they ship from Taiwan directly. Find out more at: https://www.sru-precision.com/

Ex-Arctic Ranger. Competitive practical shooter and hunter with a European focus. Always ready to increase my collection of modern semi-automatics, optics, thermals and suppressors. TCCC Certified. Occasionaly seen in a 6x6 Bug Out Vehicle, always with a big smile.
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Problem is length of pull and handguard compatability
Is there any practical reason why the stock needs to extend like 3" after the point where the upper receiver locks into it?
"We want the AUG audience, therefore we need the AUG length of pull"