More Crosman 2240/2250 Picatinny Options and Modularity

Really hadn't planned on blogging this little project, but it turned out to be pretty slick.  

Found and purchased a 3D printed picatinny rail on eBay from a seller called "ezapper".  It was made to fit most of the Crosman 22XX type guns.  Slides over the barrel and gas tube and allows for attaching things like sights, lasers, lights, hand stops, forward grips, a bipod...whatever.  It was printed with a PLA + resin which promises to be substantially stronger than the "normal" PLA print material.

The part is made for a Crosman 2240 with the stock plastic breech or a Crosman 2250/2260 with plastic or steel breech.  It WILL NOT FIT a 2240 with a steel breech without modification--the steel breech extends too far forward for this to fit--unless you shorten the shroud.

Apologies.  As I wasn't going to blog this, I failed to take the "BEFORE" images of the part as I received it.  It was kinda shiny and had very fine print lines  Wasn't quite a match to the plastic Crosman breech or grips--close, but not quite.  The print quality was very good.

Remembering my goal, "Make Things That Don't Look Like I Was Involved", I threw the 3D part along with a set of stock Crosman black plastic grips into the media blasting cabinet at work.  This worked perfectly for all the nooks and crannies of the picatinny slots.

Sorry, it's bit blurry.  Here's the 3D printed picatinny rail shroud after glass bead:

 

 

 

 

 

 

 

 

 

Installed four #8-32 set screws into the shroud.  Holes were already molded in.  Didn't bother to tap first, just ran the set screws home. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The media blasting blended and matted out the finish and removed--or at least softened--the print lines.

 

 

The Crosman grips turned a dead flat and uniform gray color.  Then sprayed everything with a healthy coating of WD-40 oil and wiped off the excess.   Back to black.

Blasted and oiled on the left.   Blasted, no oil yet on the right.   The oiled finish is a close match to a Magpul magazine.   If I don't oil the parts after blasting, the dry matte finish will show every single bit of oil from my fingertips.  I've oiled the finish so it doesn't show oil from handling. 

For fun, I installed this on a Crosman 2250 length tube and Crosman long steel breech along with a black Magpul RVG. 

While I was at it, made another AR stock adapter  that accepts my modified AR buffer tubes.

Since this is version 3 or 4 of the adapter, I added a rear facing QD socket...

 

...for a single-point sling.

So, yeah.  Options.

Option #1   Go short with a single point.

Option #2  Go longerish with a Magpul (or any Mil-Spec AR) stock.

Ended up bead blasting and oiling most of my other Crosman black plastic grips/forearms over the next few days.  Think it's a good look.

I've kinda got a themed group of Crosman airguns now:

Un  Single Shot

Deux Multi-Shot

Trois --this one

1377--What?  here:

 

Like all my projects--a work in progress.

More soon.

Yet Another Trigger? A New Trigger for the .25 Caliber QB Project Gun

Guess I'm on a roll.  I liked the way the trigger turned out on the CP1-M last time around.  Since I had a second IZH 61 trigger blade, figured I'd make something similar for a long gun.  Looking at the candidates, the .25 cal QB project gun was volunteered.

 

Pretty much same deal as the CP1-M.  Need a carrier with a stem to attach the IZH blade.

 

Pulled the trigger housing.

Removed the cover plate and took out the trigger blade.

A small piece of 1/4" thick 4130 steel.  This is probably a bit easier than it looks.  The only really important dimension is the pivot hole to the sear contact surface.  And there's some grace in that dimension due to how the two arcs intersect.

 

 

 

 

 

 

 

 

 

 

 

 

Traced the outline of the trigger and marked the pivot hole.  Rough cut some of the excess away.

 

 

 

 

Milled two opposing sides for parallel...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

...so I could clamp it in the milling machine.  A bit more shaping, then lined up for the pivot hole.  Centered up with a point.

 

 

 

 

Spotted

 

 

 

 

Through drilled with a #31.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Copying the factory QB trigger, drilled some holes to remove excess weight.

 

 

 

Getting there.

 

Some milling, some filing.  Little of this, little of that.

 

 

 

 

 

The carrier needs a small boss for the trigger spring.

 

 

 

 

A brass rod was turned down to act as the base for the spring.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cut off and the head rounded.

 

 

 

X marks the hole location.

 

 

 

I use this ground point all the time to pick up lines/locations.

 

 

 

 

Spotted and drilled for the spring boss.

 

 

 

Finally, I figured out where I wanted the trigger blade and spotted then drilled for the stem.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Like so.

 

 

 

 

 

 

Just needs some spit and polish

 

 

 

Knocked off the sharp edges then hit it on a brass wire wheel.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Test fit.  Stoned the sear contact surface. 

 

 

 

 

Pressed in the tiny brass base for the trigger spring.

 

 

 

Cut a 3mm diameter rod for the trigger stem.  Installed with a light press fit and some Loctite 680 retaining compound.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Test fit---gotta adjust the stem length before the Loctite sets up.

 

 

 

 

 

 

 

 

 

 

 

 

The IZH trigger blade isn't a precision finished part.

 

 

 

 

 

 

Clamped it to a spare 3mm drill shank and sanded out the face and radiused the edges.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Re-blued. 

 

 

 

 

 

 Assembled.

 

 

 

 

Mine's a bit chunkier.  I'll leave it for now and see if there are any problems. 

 

Here's that little trigger return spring boss.

 

 

 

Buttoned up.

 

I'll recheck after getting some shots through, but I set the trigger at about 2 lbs of pull weight.  Dialed in enough sear contact so the rifle will not accidentally fire even when banging the recoil pad against the floor. 

 

 

 

Dunno what's on the menu next.  Don't think it'll be another trigger, but that Belgian Hy-Score desperately needs a blade with more set-back--and that was the reason I snagged that plate of 4130 steel in the first place. 

Merry Christmas and Happy New Year!

Thanks for checking in.  I'll have another post soon.