PDI barrels are cold-hammer forged from stainless steel, which is the same process how real rifle barrels are produced. They have a superior tolerance and roundness of the inner surface compared to anything else on the market.
This inner barrel is suitable for the Western Arms M4A1 CQB-R, with barrel length of 210mm. Made of SUS304 stainless steel, inner diameter is 6.01mm and outer diameter is 8mm.
This product was added to our catalog on Saturday 01 November, 2008.