6 Customer Reviews
by Joel S. on 08/15/2014
"Awesome upgrade kit, I installed this inside of my WELL MB07 and it made a dramatic difference from stock performance. Paired with the new sear set I purchased with the gun, this set makes the perfect setup. I am able to hit melon sized targets from 300+ feet.
by Grant S. on 06/17/2013
"Great upgrade parts! I bought this for a build off a TSD SD700/M700 and it fit perfectly. The piston is great along with the ball bearing spring guide. If you look around, you can find the same spring guide for $30! Also, the M170 spring is great for extra power, but I'm going to need new sears for that. If you are planning on using that spring with stock sears, DONT because it will destroy them in 5 mags or so. But, all in all, great upgrade kit for someone looking to build on a budget.
by grace J. on 09/01/2011
"this is a very powerful upgrade kit!!! i would buy a new trigger system if you buy this part, it can break your spring you have been using in probably like 7 or 8 complete magazines. if you have a new one it wil last a lot longer. overall very powerful part has a lot of range and felocity
by Alec B. on 03/26/2017
"Did not fix my slam fire issue, the problem was my trigger sear, but once I added this upgrade when i fixed the trigger, the metal on metal was rubbing hard hard and even though I kept it lubricated, the piston only lasted about 2 years of heavy use before the slam firing issue came back due to the piston wearing where it caught the trigger sear. the spring guide wore out fast as well but the spring itself is nice. But I was hoping for better quality. Thats what you get with cheap China crap.
by Maxime I. on 08/29/2014
"work greats. initially lost alot of fps around 200fps because the air compression of the o-ring is so bad. once changed, wow it's torque alot and look solid. i bought the speed sear in the same time.
by Manuel O. on 11/15/2014
"THIS DOES NOT FIT BAR 10, I ENDED UP PUTTING THE OLD PISTON AND SPRING GUIDE DON'T BUY FOR BAR 10! YOU WILL REGRET IT