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Discussion Starter · #1 ·
I recently purchased a Wellfire SR22 (MB-05) and have been test firing it to zero the scope, set the hop-up and determine range/accuracy. It came with a cheap, but decent, 3-9x40 scope and bipod but internally it is 100% stock. I am running .30g precision BBs and experiencing some curving in the flight of the BBs, to a distance of 8-10 feet at 150ft down range. I did clean the barrel twice, ensure the piston chamber was lubed and fired a number of rounds to "work out" the lube and get the hop-up to settle out. The hop-up is difficult to adjust and very sensitive, but I got the rise set where I want it. I still get a significant curve to the left on most shots but not consistently; they usually start straight then drift off to the left as I watch them fly through the scope. While adjusting the hop-up I did occasionally get some curves to the right and some straight shots as well. I am an experienced marksman who understands breath control, windage, sight picture and trigger control.

1. Is this gun upgradeable or even worth upgrading?
2. If it is upgradeable, what parts will fit (L96, APS2, VSR, etc.)?
3. Do you think the hop-up is the cause of the curving? If so, how can I fix it?

Thank you.
 

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If you have fired your rifle to get the lube worked out, then I would not do anything but tear the rifle back down. Extract the hop up rubber and wash it with soapy water dry it out. I'm not indicating that any residual lube on the hop up is your problem, but for piece of mind, lets rule that out. Also, you may want to make sure that no more lube can make it's onto the hop up rubber again.

If the issue is still present, then you will need to start looking at the hop up arm or arms... this is just a start, the begining of a process of elimination
 

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Ok, I own a Mb05, out of the box your inner barrel is a 6.08 I believe, so there is going to be a lot of curving. What you basically bought was a aps2 type 96 clone with a shotgun stock. So it is highly upgradable but it will come around $1000 dollars to do so. Here is a link that has all the parts to upgrade your gun http://www.airsoftsniperforum.com/phpBB/phpBB3/viewtopic.php?t=1156&start=15 make sure to scroll that and read it all its a lot of info that will help you.

I don't want to be mean but did you think you would buy this gun and have accuracy out to 300ft with it being stock. Also there are a lot of treads here that have talked about this, so please next time do use the search.
 

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Shot gun stock? New one on me, could you explain this please? I know the origins of the L96 and similar platform stocks. I merely assumed that the MB05 and SD97 stocks were futuristic looking U.S.M.C. M40 stocks.
 

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DRAGON64 said:
Shot gun stock? New one on me, could you explain this please? I know the origins of the L96 and similar platform stocks. I merely assumed that the MB05 and SD97 stocks were futuristic looking U.S.M.C. M40 stocks.
The mb05 and sd97 are l96 platforms, but with a different body. They used to sell a stock like this one for the aps2 I think laylax made it, they called it a shotgun stock due to the shape of the grip, and check rest resembling some shotgun stocks on the market.

Here is a link to one http://www.redwolfairsoft.com/redwolf/airsoft/ProductDetail?prodID=15221 as you can see it was modeled after this one, that is also why it uses aps2 type 96 parts.

If you want to know more pm about it
 

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Very nice...and pricey! Thanks for that bit of info, learn something new every day. Sure wish there was a way to keep that hand guard integrated into the platform without causing issue with the magazine location.
 

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I also own a mb-05 and I have never had a problem with the accuracy until I over tightened my hop up and broke the arm. But I also believe it comes with a 6.03. Definetly stick with what you are going to do I always stress more then anything to clean it as well as you can at least everytime you shoot it. That's what I do with mine and it shoots great, now that the hop up is fixed. Good luck.
 

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Discussion Starter · #9 ·
Well, I cleaned out the grease from the hop-up, barrel and cylinder, applied a light coat of silicon to the cylinder and reassembled. Nothing appeared to be broken or misaligned. Test firing showed the same results, dramatic drift to the left on 8 out of 10 shots using .30g precision BBs. The other 2 shots out of 10 were straight. The hop-up is set for a slight lift for better range. I am considering getting a new hop-up unit. Thoughts?
 

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dcdye said:
Well, I cleaned out the grease from the hop-up, barrel and cylinder, applied a light coat of silicon to the cylinder and reassembled. Nothing appeared to be broken or misaligned. Test firing showed the same results, dramatic drift to the left on 8 out of 10 shots using .30g precision BBs. The other 2 shots out of 10 were straight. The hop-up is set for a slight lift for better range. I am considering getting a new hop-up unit. Thoughts?
From a quick look it seems to be a hop up misalignment problem. Experienced this with my rifle as well. Possibly a few things...

1. When you put the hop up in the outer barrel, make sure it does not rotate, as the slightest turn can cause curving shots for your results.
2. The nubbin gets misaligned in the barrel, possibly because of point number one, and causes the bb to curve. With my rifle, the nubbin was rotated to the right side, and caused a majority of shots curving to the right.

Let me know if this helps. I know you said nothing seems misaligned but possibly something happened when you were assembling everything back together?

And chappie, nothing heavier than .25s? That seems really light. Wouldn't your shots be affected greatly by the wind?
 

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Discussion Starter · #12 ·
Alright, I installed a PDI hop and a Promy TBB and a hard bucking. Shots are much straighter and my range is improved, but I don't have definitive numbers for it (I shoot across a pond in my back yard and was not able to clear it before, now I am hitting the far bank). There is still some shot inconsistency regarding the lift and some curving but still much better. Now my problem is alignment of the air nozzle into the hop-up; after 40 shots it continued to get more difficult to close the bolt and lock it down. I believe the PDI hop may be moving inside the barrel. Is the mag release screw the only thing holding the hop-up unit in place inside the outer barrel?
 

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Technically, the PDI hop up is only held in place by the magazine catch screw. However, with the use of barrel spacers, when placing the chamber into the outer barrel, the chamber can be very difficult to move.

The hop up spacers prevent any barrel vibration, and once in place of the outer barrel, the PDI chamber cannot be turned to either side without applying much force. Along with the magazine catch screw, I am pretty confident the chamber will not move.

Have you been using barrel spacers? If so, how many, and are they big enough?
 

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To check your range and get a rough idea of how far you are shooting, I would suggest Google Earth. Put in your address and then use the Ruler function set to either feet or yards and get a range estimate for the distance across your pond.
 

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Discussion Starter · #15 ·
Thanks again guys. I installed 2 PDI barrel spacers when I put in the new barrel and hop-up. They are nice and snug and hold the inner barrel tightly. The barrel does not move "fore and aft" in the outer barrel but the hop-up does move up/down/left/right slightly within the outer barrel. I will keep that mag catch screw tight (adding a little blue loctite) and see if that works.

For distance, the opposite edge of the pond is 280 feet away, and I can hit it by aiming very high, using .30g ammo. I definitely cannot hit a man sized target that far away with the elevation needed to reach that distance and variation in the curving. Still a work in progress.

Cheers
 
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