Stainless barrel 6.05 mm, XM177, M4A1, SG551, 375mm, PDIPrecision stainless steel 6.05 mm inner barrel PDI for type of weapons XM177E2, M4A1, SG551, M15A4 Carbine/TC/RIS/SPC and M15A2 Carbine - length 375 mm. Accurate and hard barrel of polished stainless steel SUS304 in this particular diameter offers the ideal balance between increasing performance and improving accuracy. The barrel without any additional surface made, which is in precise barrel undesirable because it can result in uneven coverage of the surface which in result can reduction accuracy.
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Upgrade part is also applicable to other AEG weapons with similar or shorter length inner barrel and a standard type Hop-Up chamber/bucking. With the extension of inner barrel over the base must also take into account the type and capacity of the cylinder at gearbox. The protruding end of the outer estuary are mostly hiding in the silencer.
Precision inner barrel is part of the upgrade, which together with the appropriate Hop-Up bucking significantly affects the accuracy and partially overall performance/range weapons. The smaller inner diameter, thus inevitably results to better tightening of BBs. At the same time, however, higher demands for regular cleaning and using only quality airsoft BBs (we recomend BBs from BLS). Otherwise, it may lead to a reduction of muzzle velocity as well as accidental or "suffocation," of the whole weapon. If you choose a barrel please do not make decision only according to the inner diameterand the lowest price. An important factor is also the procedure and method of production, the type of finishes, materials and the manufacturer and country where it was made.