An outstanding change for your 74u (or 100 series) AK’s with the 24mm threading. The internal compensator is about the same length as a 74 or 74u booster. The external muzzle break/amplifier threads onto that with easy. Glides right on and off. Steel material. Excellent design. $50 +$10 (shipping) Applied to an E&L AKs74u but never fielded. I sold the model it was intended for, hence: it’s up for sale Here’s a link to a short video of the application of the outer amplifier —> https://imgur.com/a/TuhitYd