Crosman DPMS SBR New Bulk-Feed setup

[Dave S]

This was my first Full-Auto Blow-back Machine Gun I ever tinkered with back in March 2019. I've leaned quite a bit since then. Having just finished the MP-40/ Thompson endeavor, I decided to revisit the SBR which was set up for tethering only using just the primary port for feeding.  Using just one 12 g. Cart is just too small of a Plenum for Full-Auto to go un-tethered using a Ninja Foster check valve. So, I rigged a 8 gram cart to feed the secondary port via 1/8 in. Pipe to 3/16" compression fitting via 2000 psi Nylon tubing fed through a drilled out M12x1.25 pitch bolt center drilled 1/4" for the tubing to exit. Once outside, it goes from compression back to pipe. The M12 bolt secures the 8 gram cart against the piercing gland. A  spent 12 G. cart  is secured in the primary port. Now the catch, the 8 G cart neck must be turned on a lathe down to .300" to fit the gland on any modern Co2 gun albeit Umarex or Crosman. The bottom of the cart is drilled out using a 21/64" bit and tapped 1/8" pipe. A little Acetone and 5 min. epoxy....and you're good to go! Any carefully regulated Scuba Tank or Co2 tank can be utilized to Bulk Feed all of my guns . Below are Pics of the setup. One tank with the long hose is for tethering the gun, the the with the Bleeder is for Bulk-Feeding. I test everything tethered. I did this 2 hours ago and it is a prototype...... it WORKS! I'll be in the machine shop tomorrow. Any Questions...feel free to ask! dave

[Dave S]

Got the Crosman DPMS finished today! HPA, Co2 Paintball setups are good to go with this gun now!  dave

[kbeefy]

Dave, is there a way to make this refillable (with a check valve) that mostly fits inside the magazine?
Looking to set up some normal capacity magazines that could be refilled to keep the pressures up without changing CO2 carts.
Maybe something like this with a check valve added/integrated....

ebay.com/itm/254748690778

CROSSMAN DPMS BULK CO2 ADAPTER - EBay

[Dave S]

Dave, is there a way to make this refillable (with a check valve) that mostly fits inside the magazine?
Looking to set up some normal capacity magazines that could be refilled to keep the pressures up without changing CO2 carts.
Maybe something like this with a check valve added/integrated....

ebay.com/itm/254748690778

CROSSMAN DPMS BULK CO2 ADAPTER - EBay

Ken, all of my SBR, Thompson, MP-40, etc.. have the 1/8" Ninja Fill-Check nipple fittings. I keep all of the Mags loaded and fully charged. BTW,  The Fill-Checks are really hard to find now. I contacted Ninja last month and production should restart in November (hopefully).  Any more questions...feel free to ask! dave