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Upgrade time! (need advice)

5226 Views 29 Replies 7 Participants Last post by  Jensen
I bought a Well MB03 almost two years ago and I have been using it off and on (a bit more off with covid) ever since. A friend recommended upgrading it with this kit:

Power Up Kit for WELL / BRAVO VSR-10 BAR-10 MB03 MB07 Series Airsoft Sniper Rifle, Accessories & Parts, Sniper Rifle Parts, Shop by Model, VSR-10 - Airsoft Superstore

This got the rifle shooting at 540 fps on 0.20g BBs, but as one might predict the stock trigger failed (in my case it was the spring guide stopper). I managed to pull one out of a donor rifle and it has fixed the problem for a while, but it is beginning to fail again. First of all, what does the spring guide stopper do? I cannot figure out why this would cause a slam fire.

Beyond that I am looking for a solution to this problem and see a few options:

1. Replace the piston guide stopper. It would be wise to replace both sears with proper steel ones. Steel sears seem easy enough to find, is there a clear recommendation on any of them? PDI? PPS? SHS? I finally managed to find a (probably) quality spring guide stopper from Laylax:

Laylax PSS10 VSR 10 Guide Stopper (

Here are some cheaper options that would have to be replaced every now and then:

PPS CNC VSR-10 trigger spring guide stopper - Online Airsoft Retail & Wholesale Worldwide Shipping (

WELL Replacement Spring Guide Bar for MB4411D Airsoft Sniper Rifles, Accessories & Parts, Sniper Rifle Parts, Shop by Model, APS-2 / Type 96 - Airsoft Superstore (not sure if this is VSR-compatible)

Any thoughts on these parts? This repair would cost as low as $6 for a cheap replacement and as high as $100 if replacing all three parts with quality brands. I have not spotted any wear on the sears yet so these could be done later.

2. Replace the entire trigger box. This will work for another few months before needing to be replaced again. Would cost around $20. No good reason to do this over just the spring guide stopper except part availability.

3. Upgrade the trigger box with a 90 degree trigger. This seems to be the most recommended option, but will easily be the most expensive at $120 to $210. If anyone is selling one I would definitely be interested :) I may post a wanted ad later...

4. Something I have not thought of. You do not know what you do not know until you know it.

Additionally, I am also thinking of replacing the cylinder since the front of mine is becoming deformed. I hear that the stock piston on the Well MB03 is out of spec, will a VSR-10 one fit the MB03 receiver? Is there anything else on the MB03 that is out of spec?

Thank you for the input!
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Have you tried the AirsoftPro trigger? I have heard good things about it. He also sells a decently priced cylinder:

For VSR, BAR10, MB03, CM.701 : Black steel cylinder for VSR , CM.701, BAR10 and Well MB-02, 03, 07... -
It's a good trigger and cylinder set.
The issue is that the cylinder has a smaller diameter than regular cylinders, but it doesn't really affect anything.
You might have to sand down the glide rings on your piston though.
Airsoftpro makes good products for vsr10s, however, avoid their hopup units and springs.
The springs are bad and the hopup unit is a PDI clone which makes it a pain in the a**e.
I have never heard good things about Angel Custom parts, has something changed?
Some parts are actually OK.
Their vsr10 trigger and aeg kratos piston as well as some externals are actually worthwhile.
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