I (ashamedly) own a Crosman 3622. questions on modifications

[Gibsonvair]

I will share my experience with the 3622. Unfortunately I will be watching four of my grand children, all under six years old for the next few days. Not conducive to airgun testing and tuning. It may be a few days till I can tell anything. Right now, cans at 25 yards aren't a problem. It's that 1/2 or even 3/4 " group I haven't achieved. When push comes to shove, I test pellets from a good bench rest using a good scope. That is coming.

In my experience LW barrels are worth every nickel when it comes to accuracy. Any decent machine shop can take measurements from the original barrel and match the new barrel to those. They can do it relatively cheaply too.

As to "older tech" in airguns... Simplicity makes for simpler repairs.

Cheers,

J~

My question is whether the Marauder gen 1 Lothar Walther barrel is a good place to start and do I have to change the breech to use it on the 3622.

 

[Gibsonvair]

With the long steel breech and Williams WGRS-54 rear peep, the rifle now weighs 4lbs. 2.8 oz. I hope to lighten it a few ounces with an aluminum breech as soon as my part comes from China. I plan on making a fine (.040") fiber optic front sight from the Buck-Rail silencer adaptor that has the front post built in. This is the Williams Western front sight insert which I have and love. They come with extra fiber optic rods. I may even shape the whole assembly with a file to fit into the Buck-Rail dovetail on their suppressor adaptor. I have made skeletonized globes (hoods) from sections of EMT conduit and then epoxying it into place. Putting holes or large slots in a globe makes the fiber optic light up but protects the delicate post.

 

[Gibsonvair]

Also looking forward to the release of this Buck-Rail silencer!

 

[Fly]

Ya Terry is making so good stuff for great price. I wish he would start making stuff for more than just Crossman manufacturing .

 

[Treefrog]

I will share my experience with the 3622. Unfortunately I will be watching four of my grand children, all under six years old for the next few days. Not conducive to airgun testing and tuning. It may be a few days till I can tell anything. Right now, cans at 25 yards aren't a problem. It's that 1/2 or even 3/4 " group I haven't achieved. When push comes to shove, I test pellets from a good bench rest using a good scope. That is coming.

My question is whether the Marauder gen 1 Lothar Walther barrel is a good place to start and do I have to change the breech to use it on the 3622.

I imagine that you can find (or ask) for the barrel dimensions that you need for the original Crosman LW barrel. Measure yours and then compare.

Cheers,

J~

 

[Chief Ten-Beers]

Also looking forward to the release of this Buck-Rail silencer!View attachment 486497

Interesting! I had not seen that prototype!

 

[Gibsonvair]

Well, after a few days, I received a Chinese aluminum breech that was ordered from E-Bay
It saves 128 grams over the Crosman steel breech. The Crosman weighs 196 grams and the Chinese one weighs 68 grams. The rifle scoped and suppressed weighs 5lbs 3.30z. At 23 yards (68 feet) I am consistently getting hole on hole groups and the worst are 7/8". A "flyer" is 1/2" off point of aim. I am using JTS 16.08 grain pellets. Those are the accuracy results so far. I hope to test out to 30-35 yards.

Here is a shot sting from a 2,000 PSI fill:

1) 657.8 16) 703.5 31) 652.3
2) 662.8 17) 707.5 32) 642.8
3) 673.4 18) 710.7
4) 679.5 19) 711.5
5) 681.8 20) 714.8
6) 649.0 21) 715.7
7) 690.9 22) 709.9
8) 694.8 23) 706.7
9) 697.9 24) 703.5
10) 698.7 25) 699.5
11) 699.5 26) 695.5
12) 701.9 27) 686.3
13) 704.3 28) 679.5
14) 705.9 29) 671.4
15) 707.5 30) 662.8


Modifications are such: Aluminum breech
.173" diameter transfer port (Peter Nollan E-Bay)
drilled valve to .173"
drilled barrel port to .173"
radiused short turn inside valve
re-crowned barrel
Hawke Vantage 2-7x32 AO scope
shimmed front barrel band around pressure tube and barrel
Buck-Rail suppressor, adaptor and fill cover
relieved stock to access hammer spring adjuster
short, stiff hammer spring
1/2 turn out on hammer adjuster
lighter trigger return spring
lessened tension on sear spring/safety spring

 

[Gibsonvair]

I just checked my chronograph results with the JSB 14.35 grain pellets. Oddly, they make 2 ft/lbs more energy across the board than the JTS 16.08 and about 100 FPS more velocity. They are not accurate enough for me in the 3622 rifle, so JTS 16.08 it is for me..

 

[Simplemann]

Them groups are more than sufficient IMHO Good shooting

 

[Gibsonvair]

Them groups are more than sufficient IMHO Good shooting

I was very relieved to get those tight groups since previous efforts had failed. I tried the JTS pellets on my 362 and they were a no-go. I may re-crown the barrel on that one also.

 

[Chief Ten-Beers]

How do the Crosman compare to the 14.3 JSB?

 

[Gibsonvair]

How do the Crosman compare to the 14.3 JSB?

I still have a little daylight. I will shoot two 5 shot groups as tuned, one Crosman and one JSB and report back!

 

[Gibsonvair]

Crosman's on the left at .990" and JSB on the right at .530". The singular target is JTS 16.08 at .440"

 

[Gibsonvair]

UPDATE on 3622 performance.
I was able to get three 30 shot strings with most of them on paper at 23 and 30 yards. Here are my results.
All from a 2,000 PSI fill: 23 yards, shots 8-28 on a single target.
23 yards, shots 5-25 on a single target (scope adjustment)
30 yards, shots 1-30 on a single target (no hold from 23 yards)

 

[Gibsonvair]

I purchased the modular silencer from Buck-Rail. It is made of Nylon, I presume on his new machines. It can be taken apart and cleaned. The nylon material should be very tough. I have broken one of the old style silencers ( I glued it back together) Terry has replaced any broken pieces or he would have refunded, from what I have experienced. The modular silencer is just as quiet as the other Buck-Rail ones or even my Donny RYU, which is four times the cost. I do love how quick the RYU comes on and off. I would recommend both models. The Crosman 3622 fill nipple cover got moved to the gun in the lower part of the picture and the 3622 wears the Buck-Rail cover.

 

[Gibsonvair]

Just a little tidbit. The weights of silencers are as follows: Donny RYU 124 grams, Standard Buck-Rail 64 grams, Modular Buck-Rail 58 grams.