The First Factory Slim 5 inch Outer Barrel Piece gives you the freedom to change your outer barrel to your preferred length while keeping a clean, authentic profile. It is designed specifically to match the slimmer outer barrel diameter of ?17.5 that is commonly found on various overseas airsoft guns. Compared with our ?Tokyo Marui M4 Outer Barrel Piece,? which matches the ?19 outer barrel diameter of Tokyo Marui M4 series airsoft guns, this slim version is noticeably narrower. That difference allows it to attach seamlessly to overseas airsoft gun outer barrels and preserve their original appearance.

Each barrel piece features O-rings at the joints to prevent loosening, so the assembly stays secure during use. Manufactured with high-precision, purely Japanese workmanship, the piece achieves a tight clearance with the inner barrel even in its connecting structure. O-rings are also installed inside the outer barrel, firmly holding the inner barrel and helping to improve accuracy.

The product contents include one outer barrel piece, one accuracy ring, which is a small O-ring, and one anti-loosening ring, which is a large O-ring. Its specifications are a 14mm counter-clockwise thread, a male thread length of 13mm, and a female thread length of 14mm. It is compatible with airsoft guns that have 14mm counter-clockwise threads and with our outer barrel base series. Whether you are refining an overseas airsoft build or simply looking for a slimmer, more precise outer barrel solution, this piece offers a secure fit, a clean appearance, and improved inner barrel stability.

Key Features

• First Factory Slim 5 inch Outer Barrel Piece lets you change the outer barrel to your preferred length.

• Slim type (?17.5) matches the outer barrel diameter of overseas airsoft guns.

• Designed for the slimmer ?17.5 outer barrel diameter used in various overseas airsoft guns.

• Slimmer than our ?Tokyo Marui M4 Outer Barrel Piece,? which matches the Tokyo Marui M4 series ?19 outer barrel diameter.

• Ensures a seamless fit when attached to overseas airsoft gun outer barrels, maintaining their appearance.

• Each barrel piece features O-rings at the joints to prevent loosening.

• High-precision, purely Japanese manufacturing achieves a tight clearance with the inner barrel even in its connecting structure.

• O-rings are also installed inside the outer barrel, firmly holding the inner barrel and improving accuracy.

• The package contains one outer barrel piece, one accuracy ring (small O-ring), and one anti-loosening ring (large O-ring).

• The thread is 14mm counter-clockwise, with a male thread length of 13mm and a female thread length of 14mm.

• It is compatible with airsoft guns that have 14mm counter-clockwise threads and with our outer barrel base series.