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Upgrade time! (need advice)

5223 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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90° or nothing
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Sorry I’m late to reply. A lot of people chimed it with good help. I like Edgi cylinders. Overkill for airsoft but that’s how I build my airsoft sniper rifles. Way overkill, way too much time and money invested. The AA twisted cylinder is nice, and AA cylinders come as a set with the head. I also stand by airsoft pro. However AirsoftPro is a slightly smaller diameter cylinder. I know an airsoft pro piston can fit a standard cylinder if you swap o rings to make it seal. But idk about vice versa. Typical rule of thumb is match brands and you shouldn’t have sealing nor fitment issues. Key word is shouldn’t. Anyway the airsoft pro v4 kit is amazing. I wish I never sold mine. Get the cylinder and head and you’re all set. Cheaper and better than the same parts in action army in my opinion. Only problem is. Airsoft pro kits are usually out of stock. In stock? Jump on them. They sell the 90° trigger as a stand alone too. Which I think is THEE ultimate bang for your buck 90° solid af trigger.
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