DEALING WITH CROSMAN 13xx & 22xx FORWARD BREECH SCREWS

[mooseslayer]

I stripped a few on my disco and had to buy a small EZout to remove. So I found a link to drilling and tapping to a 6/32 and have never had a problem since. I had to chuck the new bolt in my drill press and file it down to fit but have had it out many many times without a problem. I will try to find the link to the fix.

[mooseslayer]

Here are the instructions I followed.

I usually just end up replacing the breech screws with 6x32 button head screws... I learned with my disco which has the same tiny #4 screw that they are just way to easy to strip.... so I picked up a handful of the 6x32 button heads in stainless.... simple matter to retap the hole on the tube, don't even need to drill a fresh hole just start our tap in the hole that's there... its big enough it will recut perfect threads. You then need to hit the breech hole with a #27 drill bit and then turn the head of the screw down a touch and/or open the counterbore of the hole up a bit..... I usualy turn the screw head down to about .214 and then use a 7/32 (.2188) bit that I ground the face flat (or a 7/32 end mill if you have one lol) to counterbore the hole....

 never strip a breech screw again and holds MUCH nicer...... combine that with clamping the breech for assembly/disassembly and life is a lot easi

[moorepower]

6-32X1/4"  low profile 145KPSI  socket head screw from McMaster Carr. pn 9222OA141. You can reduce the head size or increase the size of the hole in the breach. This is the same type of screw used in PCP valve retention, only smaller.

[Blue]

On a separate issue regarding these screws,
Is there a way to raise the head when using the steel breech in order to avoid having
the pellet-catching depression?
Is the screw hole countersunk deeper in the steel breech?
At least in the .177 breech, the pellet snags at the breech screw when loading.
That cannot be a good thing for pellet shape and accuracy.

I fill the depression with candle wax.  I put a small amount of soft wax (I don't drip straight from the candle but take a small amount of melted wax before it hardens) into the countersink then smooth it before it dries.

Keeps the pellet from "nosing" down into the hole as the bolt is closed and is easy to remove whenever you need to take the screw out.

Blue

[mobilehomer]

Go to a local RC hobby shop and buy a PRECISION GROUND .050 Allen driver. These fit the screw with little to no clearance. Almost impossible to strip.

[Ronno6]

On a separate issue regarding these screws,
Is there a way to raise the head when using the steel breech in order to avoid having
the pellet-catching depression?
Is the screw hole countersunk deeper in the steel breech?
At least in the .177 breech, the pellet snags at the breech screw when loading.
That cannot be a good thing for pellet shape and accuracy.

I fill the depression with candle wax.  I put a small amount of soft wax (I don't drip straight from the candle but take a small amount of melted wax before it hardens) into the countersink then smooth it before it dries.

Keeps the pellet from "nosing" down into the hole as the bolt is closed and is easy to remove whenever you need to take the screw out.

Blue

Excellent! Thanks!

[Rogergendron1]

An m3 machine screw with a alen head counter sunk head, spun down on a drill with a file sits dead flush!
Pic ... mine is a stainless steel m3 and it's way way more secure , definitely feels better knowing it WILL NOT strip out lol !!