Silverback

“GBB” cut inner barrel, passivated brass, 6.05 mm bore, 507 mm long,
Ideal for:

– “510 mm” TAC-41 outer barrel used with “GBB” hopup unit.

Carbon Barrel Extension, L Size

SRS Variable Mass Piston | Pull Bolt

SRS Open Piston Sear

Designed to fill the gap between the receiver and the stock when SRS-A2 is used with-out handguard.

Carbon Bolt Knob

Bolt Head (Monolithic)

APS 13 mm, 100 Newtons spring


This spring is following the “APS 13 mm standard” (for 9 mm outside diameter spring guide). It will fit any rifle compatible with this standard, including all SRS (except push mechanism) and all TAC-41. While being compres

CNC Steel version of the variable mass piston body, for extreme mass configuration (55.1 grams instead of 19.0 grams for the aluminium version).


Compatible with:



– original SRS piston (SBA-BPS-13)

– original TAC-41 piston (SBA-BPS-30)