MaxZBulk
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Some of the most innovative and unique products have come from the mind of this crazy one-armed Hawaiian. His wonderful bulk fill system is the only one on the market that is detachable so as to not alter the gun in any way. He also came up with an 80 shot pellet magazine that fits on the 600. Max is a great guy and easy to deal with.
WRITE TO MAX FOR PRICES
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NEW

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I just finished this yesterday.
I got the Stock from Sportsman's Guide. I threaded an Aluminum Bar to attach to the CR 600.
I made a longer tube to make room for the 4 Oz. Bottle.
It is a Reverse Bulk with Barrel from a 2250.
Mmmmmmmm Maybe make an 80-pellet Magazine within the Stock?
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My first purchase from Max.
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Some products from Max.
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BULK
The one thing that makes Max's products stand apart from other bulk fill items is that there is nothing permanent done to the gun. The adapter fits into the gas tube and replaces the C02 powerlet. They can then be fitted with any size C02 bottle.
These bottles can even be fitted with hoses for remote bulking. And as you can see...there are many different bulking adapters.
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The Adapter
Max makes an adapter for many of the airgun models out there. Here are a few of the ones I have pictures for. I am sure he makes more but it would be better to ask him.
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Crosman 38C Bulk
Mark I, II and LD Pistol
DROZD
Airsource Bulk Adaptors
Crosman 600 Eighty Shot Magazine
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Without a doubt, one of the most innovative and original mod products that anyone has come up with in the airgun community. This cylinder shaped device is capable of holding eighty+ pellets and cleverly attaches to the gun making it totally reversible.

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Crosman 600 Examples
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Max Balbuena
1626 Kalaepaa Dr.
Honolulu, HI. 96819-3009