Here's a video to help clarify:
When I first received my Ertl Pump Action Shotgun (PAS) I was actually a bit surprised by how small this blaster was. Due to it’s size I decided to give the gun a little heft. To accomplish this I decided to make a housing setup for an RSCB. But before I started building it I was curious about one thing... why hasn’t anyone added springs to an RSCB before (assuming I haven’t missed someone posting it somewhere, which is completely plausible). I thought if a spring loaded RSCB would work then that would give me a better excuse to build the RSCB housing.
After playing with some air restrictor (AR) springs and an RSCB I realized it does work and it’s gonna make the PAS a bit more fun.
To create a spring loaded RSCB (this is a temporary version until I can find a suitable single continuous spring replacement) all you have to do is interweave some AR springs into your reservoir in the RSCB (I added 16 springs into a footlong PETG reservoir).
I would also recommend hot gluing a spring to the back wall of the RSCB (to help keep the springs in place) and hot gluing a “pusher” piece of larger foam backer rod (FBR) or maybe a rubber washer that fits onto the end of your interwoven spring to help push the dart and help prevent the spring from shooting out of the gun when you fire it.
Then plug your newly springed reservoir into your Tee, elbow, barrel setup and it should be ready for testing.
To create the housing for the RSCB you will need (Lengths were what worked for my setup other lengths may work better for different PAS mod setups):
2 pieces of 1-1/2” PVC (13-1/4” and 1-12” Lengths)
1 piece of 1” PVC (4” length)4 or 5 1/2” Tubing Straps
Take the 13-1/4” length of PVC (Piece A)and cut off the bottom so that it can slide over the front and rear sites on the PAS
Once you have Piece A cut properly. Insert a Tubing Strap into Piece a with it’s open end faciing Piece A’s open end (if Piece A is cut properly the Tubing strap will fit like it was meant to go in there).
Next snap Piece A with the Tubing Strap over your RSCB on your PAS (I chose to cover half of the Tee with the housing.) and adjust it to the position you would like it to stay in.
Push the Tubing Strap as far to the front of the RSCB reservoir as it can go. Once it is in place hot glue the Strap to Piece A
Put aside Piece A for now and take the 4” piece of 1” PVC (Piece B ) as we will be creating an RSCB Stabilizer
First cut a hole approximately 1” wide by 2” long into into the bottom of Piece B to fit over the rear site
Put Piece B over the rear site and attach the RSCB. Mark where the RSCB should rest in Piece B and then cut out the RSCB resting place
With Piece B and the RSCB on the PAS put a 2nd Tubing Strap at the back of Piece A and slid it into place (this should give you the proper location for the rear strap) Take note of the Tubing Strap position. Remove Part A and the Strap and glue strap into place.
Add a few more straps into Part A for added security.
(if the darts stick in any section of the RSCB with the Tubing Straps attached, file away a little of the inside of the tubing strap)
Once Part A and Part B fit to your liking, measure the length(if any between the front of the PAS and the Front of the Housing. The difference between the two should be the length of Part C (the 1-1/2” piece of 1-1/2” pvc in my example)
Cut Part C to length and test it with your RSCB setup ( you may need to shorten it or notch out a section to fit the RSCB.
Once you have Part C lined up with Part A to your liking, glue them together and you have created the main housing.
You will now have all the pieces made, now assemble it.
Clip the RSCB inside the main housing
Put the RSCB Stabilizer over the rear sight
Slide the Housing/ RSCB onto the PAS.
- My setup used both the 1/2” PVC and CPVC couplers for stabilizing the RSCB into the PAS.
- The RSCB rarely double feeds, the only time it's happened to me was in the 2nd video I posted. I believe due to the weakness of the AR springs, they don't have enough force to move the darts fast enough forward to double feed.
- It is winter in Ohio... I haven't had a chance to test ranges and my living room hardly counts as an effective testing ground.
- Next version will probably use a rubber washer and a continuous spring (assuming I find some that work)
- To reload, simply take off the front barrel and feed the darts in through the CPVC Tee then throw the barrel back on
Edited by nihil413, 09 February 2010 - 08:01 PM.