Made in the USA of Cold Hammer Forged (CHF) Steel. This is the highest quality, best valued US made MP5-N barrel available. This high quality barrel is processed using the highly desirable Nitrite process (same process as Sig Sauer uses on all barrels) which creates a super hard durable finish. Premium CHF steel barrel blanks. Precision milled to the latest specs with the factory correct and updated 16 flutes in the chamber. Three lug & threaded 1/2 X 32 with matching thread protector just as the factory HK German barrels are threaded. Each barrel is manufactured to spec to accept suppressors and other muzzle attachments with ease. Brand new never installed and ready for that build, a must for those looking for a replacement or spare. Meets & or exceeds Heckler & Koch factory specifications. This is simply the finest MP5-N barrel for the money anywhere!