Grenadine [BETA] - Nerf blaster bolt action chạy bằng CO2

I CAST WALL OF TEXT

I am an airsofter who has just moved to a place with no airsoft fields nearby. There is, however, a local nerf club. I decided to put a blaster together and give that a shot. This project is that. It's my first time, so be gentle.

My vision is for a CO2 powered, select fire semi/fully automatic, gas blowback nerf blaster. It uses the valve/reservoir out of a donor Rekt Jury (nerf) or H8R (airsoft) CO2 revolver. Mechanically, it functions very similarly to an airsoft GBBR, except it draws from a CO2 cartridge in the grip instead of a reservoir in the magazine. It uses worker style magazines and half length darts. 

While working on that, I decided to make a version of the upper receiver without a gas system, that way I could test raw gas output without a gas action drawing CO2 away. What better way to do that than to make a bolt action version of the upper?

I am still working on the automatic upper receiver, but the bolt action upper just slaps onto the lower receiver that I already have drawn up. At this point in time, the bolt action version is a finished blaster. It feeds, cycles, fires, and does everything else you would expect out of a blaster, hence why I am posting it here. I will probably just continue developing the automatic version and release it as a remix of this one.

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Details

Here is the results of my FPS testing. I took 15 shots with each barrel setup. Measured in ft/s

30cm 12.8mm ID barrel, no scar:

• Average - 290.1

• Lowest - 287

• Highest - 315

• Median - 288

Notes: about 1 in 30 darts would "tumble" in the barrel, causing a jam that needed to be fixed with a cleaning rod. I am using cheap darts from walmart, so that might be my bad.

30cm 13mm ID barrel, no scar:

• Average - 220.5

• Lowest - 190

• Highest - 244

• Median - 218

Notes: Much less consistent, but didn't jam at all.

30cm 12.8mm ID barrel, with quickstring scar

• Average - 288.8

• Lowest - 260

• Highest - 308

• Median - 278

Notes: Not much loss of fps, but significant accuracy boost

30cm 13mm ID barrel, quickstring scar:

• Average - 214.1

• Lowest - 181

• Highest - 230

• Median - 202

Notes: Basically indistinguishable from the one without the scar on it, in both fps and accuracy

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Bill of materials

Screws

• 2x M3x40 machine screws

• 2x M3x30 machine screws

• 2x M3x20 machine screws

• 1x M3x15 machine screw

• 7x matching M3 nuts

Pins - I bought lengths of 5mm steel rods on amazon and then chopped them up to use as pins

• 5x 5x36mm steel pins

• 3x 5x20mm steel pins

• 1x 5x50mm steel pin

springs - pulled all of the springs for this build from this box of assorted springs from Harbor Freight

• 9x8mm spring (magazine release)

• 10x12mm spring (trigger)

• 10x12mm spring (striker)

orings

• 1x AS568 oring (1/4" ID, 3/8' OD, 1/16" thickness)

other parts:

• CO2 reservoir/valve from a Rekt Jury CO2 nerf blaster

Build guide

I'll make a build guide when I can find the time. Just wing it for now, message me if you need any help. 

-Spectre the Wise on not having a build guide