You may use the bulkfill you have but will need a metric collar to secure the unit. The bulk tube has American threads on one end and metric on the other. This allows both QBs and Crosmans to use the parts. Smart. Mac1 can provide the part. Sorry about the postage. Don't try using the current collar. I mixed up the parts and had a blow-off. No injuries but the gun locker is dented. Dave
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