Fps fluctuations with co2 airgun

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Armoredshell

Post subject: Fps fluctuations with co2 airgun

Posted: Fri Sep 22, 2023 4:33 pm

Joined: Tue Apr 26, 2022 7:48 am
Posts: 113
Location: Edmonton

Any thoughts or theories on this, fluctuations on fps, temperature was plus 20C
Waited approximately 2 seconds between shots Happened with both magazines
Using Crosman copper heads 4.5mm
On a Crosman DPMS no mods although rubber bb holder has a slight nick
Please see pic

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File comment: Temp 20C

A0C2BD00-D82A-4878-8E69-C04E687A3EFE-868-00000ADE3D58A9CA.jpeg [ 236.19 KiB | Viewed 547 times ]

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YepYep

Post subject: Re: Fps fluctuations with co2 airgun

Posted: Fri Sep 22, 2023 4:49 pm

Joined: Wed Jul 26, 2017 7:01 pm
Posts: 5145
Location: GTA, ON

Try the other BBs? I like the UX one better... Normal or the black color...

And maybe wait to 5 second?

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Armoredshell

Post subject: Re: Fps fluctuations with co2 airgun

Posted: Fri Sep 22, 2023 4:56 pm

Joined: Tue Apr 26, 2022 7:48 am
Posts: 113
Location: Edmonton

A few days ago both magazines where very consistent with the expected loss due to usage ie started at 440 dropped 1-2 fps per shot But now fluctuates

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YepYep

Post subject: Re: Fps fluctuations with co2 airgun

Posted: Fri Sep 22, 2023 6:14 pm

Joined: Wed Jul 26, 2017 7:01 pm
Posts: 5145
Location: GTA, ON

Leaks? loosed parts? Capsule not penetrated well (you can check the little hole when you emptied the co2 in shooting session... )

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Armoredshell

Post subject: Re: Fps fluctuations with co2 airgun

Posted: Fri Sep 22, 2023 7:21 pm

Joined: Tue Apr 26, 2022 7:48 am
Posts: 113
Location: Edmonton

My train of thought is leading to the BB follower (aka the breach) since it’s nicked and could be potentially leaking And yes I ordered a new one So we shall see

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Armoredshell

Post subject: Re: Fps fluctuations with co2 airgun

Posted: Tue Sep 26, 2023 10:40 am

Joined: Tue Apr 26, 2022 7:48 am
Posts: 113
Location: Edmonton

New bb holder (crosman part C4213-W1-U3) $2.58
Was a sealing issue outside temperature at these shots plus 14C
Cheers

Attachments:

File comment: New bb holder

DB7077FD-F0B5-45C2-9F2A-A636C2277696-61019-00000E9CA8CB8560.jpeg [ 276.9 KiB | Viewed 448 times ]

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