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PostPosted: Thu Jun 27, 2019 8:54 pm 
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Joined: Fri Oct 20, 2017 8:29 pm
Posts: 337
Location: Southern Gulf Islands, Beautiful British Columbia, Canada
Good afternoon everyone!

Some time ago I purchased a lovely Cometa Orion .22 Rifle from another fine member here on CAF, and it performed to spec. However, right from the get-go, cocking this Spanish made Bolt Action rifle required enormous effort -the action was so heavy as to be almost unusable for bench-rest FT. I literally had to rest the butt of the rifle on my thigh and pull down hard on the bolt for each and every shot. Alternately, grasping the bolt with three fingers and applying pressure with one's thumb quickly became a painful exercise. Since I really like the looks of this airgun, I thought I'd try a few experiments to see if things could be improved, and indeed they can!

First I lightened the action by installing a lighter hammer spring. Second, I lightened the trigger pull and effort required to lock the bolt action in the ready-to-fire position by cutting one coil off a second spring within the internal workings of the trigger assembly. Unfortunately both trigger pull weight and ease of bolt locking action are tied together in this particular design (definitely not one of the best) so great care must be taken not to cut too much spring length / lessen spring strength to the point of creating a hair-trigger issue.

The result of these two mods improved the Orion's action equivalent to my Benjamin Marauder First Gen, which was a huge step forward. Downside however was a drop in FPS from a max of 800 (somewhat adjustable via external Allen Screw) to 530 FPS. For sure this terribly loud rifle was suddenly a lamb not a lion in terms of noise, but I wanted a little more velocity so had to look at further modification.

What I ended up doing in the end was removing a plastic housing inside the sling-shot style hammer assembly and replaced it with an identical chunk of machined Brass (helps when you have a buddy with a metal lathe). This increased the mass of the hammer, while dissimilar metals helped reduce hammer ping. End result? Now I own a Cometa Orion with the action of an M-Rod and a Max FPS of 950 FPS, significantly exceeding the factory velocity of 800 FPS. Now, by external adjustment of the Allen Screw that applies pressure to the hammer spring, I can achieve a range of velocities between 730 FPS and 950. Beauty Eh?

If there are other members who own this particular air rifle, it would be great for some feedback on your experience with cocking effort.

Cheers!

Avianmanor


Attachments:
File comment: The Beast
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IMG_1279.jpg [ 148.36 KiB | Viewed 824 times ]
File comment: Orion Hammer Assembly & Custom Machined Brass Insert
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IMG_1264.jpg [ 179.79 KiB | Viewed 831 times ]
File comment: Cometa Orion Hammer
IMG_1265.jpg
IMG_1265.jpg [ 132.33 KiB | Viewed 831 times ]

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PostPosted: Thu Jun 27, 2019 11:06 pm 
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Joined: Sat Mar 16, 2013 5:15 am
Posts: 3582
Location: Edmonton
Yet another great tip, Aaron.
Great headline, too. People will actually be able to search for this simply by searching headlines and using "Cometa Orion."
How handy can that be!
Hats Off to you!


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PostPosted: Thu Jun 27, 2019 11:27 pm 
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Joined: Sat Nov 05, 2016 10:52 am
Posts: 2948
Location: Caronport, Saskatchewan
Very good! I love the looks of the Orion and tge adjustable cheek piece as well! You really made some major improvements!

Sent from my EML-L09 using Tapatalk

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PostPosted: Sat Jun 29, 2019 8:14 am 
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Joined: Sun Jan 29, 2012 7:31 pm
Posts: 696
Location: Halifax, NS
Excellent post!

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PostPosted: Mon Jul 29, 2019 2:48 pm 
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Joined: Fri Oct 20, 2017 8:29 pm
Posts: 337
Location: Southern Gulf Islands, Beautiful British Columbia, Canada
Hello everyone,

Here's a shot string (FPS) of the modified Cometa Orion taken with the new FX Radar Pocket Chronograph. This is an unregulated PCP rifle as is apparent in the results, however, velocity far exceeds spec and the cocking effort has been reduced by half -this rifle is now a pleasure to shoot Benchrest FT. It is however, very very loud! Hearing protection is a must!

939
942
942
950
951
953
946
926
939
946

Cheers!

Avianmanor

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*Air Arms S510 Extra*FX Streamline*Daystate Huntsman*Hatsan BT65*Benjamin Marauder*FX Dreamline*Cometa Orion*Weihrauch HW100S*QB78D 875 FPS*Brocock Concept*Artemis PP700S-A*Diana Chaser*Snowpeak CP1-M*Artemis PP800*FX Radar*Kral Puncher*Artemis M11*


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PostPosted: Mon Jul 29, 2019 3:05 pm 
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Joined: Fri Dec 14, 2007 3:10 pm
Posts: 862
Location: Central BC
That’s looking great. Wonderful results. I think you took the only real weak point of that gun to a new level. Very well done. I think it’s a true bargain as it comes from the factory and you’ve just made it that much better.

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