USED F5 MFG Modular Stock System For CZ Bren 2 Adapter Black F5-MSSCZB2-BLK. These products are designed and manufactured with quality and performance in mind. The telescoping left side-folding polymer stock is fully adjustable for comb height and length of pull making it a versatile option for the most advanced applications. Specifications for F5 MFG Modular Stock System with CZ Bren Adapter: Manufacturer: F5 MFG Color: Black Stock/Brace Material: 6061 Aluminum Gun Model: CZ BREN 2 Gun Make: CZ Features of F5 MFG Modular Stock System with CZ Bren Adapter All NFA rules apply (if using this product on a pistol) Adapter machined from 6061 Billet aluminum 922r compliant Includes both the Adapter and Modular Stock System Package Contents: F5 MFG Modular Stock System with CZ Bren Adapter CZ Bren 2 Adapter Modular Stock System F5 MFG F5-MSSCZB2-BLK: Modular Stock System For CZ Bren 2 Adapter Black