Ollie Talks Airsoft goes over the Hephaestus Enhanced Recoil Spring for TM AKM & AKX gas blowback rifles to check if there is enhanced performance from these gas blowback rifles. The Hephaestus Tokyo Marui AK GBB Series Enhanced Recoil Spring is a drop-in upgrade for the TM AK gas rifles that provides increased recoil for a more realistic shooting experience.

Mr. Otako has a review Nineball Hard Recoil Spring & Short Recoil Bush for the SIG Air M17 Gas Blowback Pistol from Laylax. The SIG Air M17 pistol in this video review is CO2-powered one tha meets Japan regulations for survival/sabage games, which is how they call airsoft skirmishing in the country.

Video from Laylax showing how to install the Tokyo Marui M1911A1 Recoil Spring Guide and Recoil Spring Set NEO sold under the Nine Ball brand... "A set of recoil spring guides and recoil springs that can be used with the Tokyo Marui gas blowback gun, M1911A1 series.

Friction is reduced by adopting a stainless steel spring guide polished to Ra 0.8 to 1.0. Equipped with a thrust bearing to eliminate twisting when the spring expands and contracts.