Guarder Enhanced Recoil / Hammer Spring (150%) for Marui & Compatible M9 series Gas Blowback

"I have a KJW Government Model M9 and this really made the gun feel unique and nice. i wasn't a big fan of the gun when i first bought it but the spring upgrade really made it feel nice with the recoil and its overall a million times nicer now

"bough for my hfc m9 full auto rate of fire is amazing on full autp a simple and ez upgrade should take five minutes at the longest to install

Pros

Ez installation
improved rof
nice added kick
just as advertised
low cost

Con

Increase Wear and Tear

"amazing spring set, makes my beretta feel good, very nice and solid. hammer spring is a little difficult to install because you have to take the trigger assembly out of the lower reciever. but, feels amazing, no more accidental fire due to weak springs.

"This spring set is greatly increase the rate that your gun cycles, and the "recoil" felt by the shooter, but as a result this will make your gun much less gas efficient, because more gas is needed to push the slide back, also increases wear on parts, but that's a given with any upgraded spring (for AEG's or GBB's). But it does exactly what its supposed to do and it does it well to 5 out of 5.

"I got this spring set for my KJW M9 and it does its job. The recoil has been slightly increased along with the ROF ability has increased. However, gas consumption and wear and tear has been increased. The biggest con is it doesn't come with directions and for people who are inexperienced in gas pistols (like me) it is slightly confusing.

"This has been a very good quality recoil spring. The slide pulls back with a clean snap every time. The only problem with it is it has forced me to use green gas or propane. Before I could use HFC 134, but the slide won't kick back far enough to load another round in the chamber with this recoil spring installed. So far I haven't had any problems with green gas though, so I would definitely have to recommend this. The slide slides back forward much faster than before, and it doesn't seem to have caused any damage to the slide or the gun itself. Definitely a good buy.