Search found 11 matches

by Mainliner
Sat Apr 01, 2023 11:51 am
Forum: TECHNICAL
Topic: Air Arms Alfa Proj Air Cylinder Removal.
Replies: 6
Views: 15310

Re: Air Arms Alfa Proj Air Cylinder Removal.

Undoubtedly a little late, but for future reference the full specification is:
'3x1.5 O RING 70 SHURE'

There's a useful exploded parts diagram of the pressure vessel, courtesy of R-Gun Pete of Canadian Airgun Forum at:
https://www.airgunforum.ca/forums/topic90163.html
by Mainliner
Sat Feb 19, 2022 10:18 am
Forum: TECHNICAL
Topic: Increased Power = Increased Accuracy?
Replies: 7
Views: 9534

Re: Increased Power = Increased Accuracy?

Thanks for your reply.

You're probably right about flat-headed pellets being used at 25m. The clue's undoubtedly in the name - RWS R 10 Match - clearly designed for 10m!

But that still doesn't explain the poor grouping I now get at 10m, when the power is set to 11.5 ftlb.
by Mainliner
Sun Feb 13, 2022 10:56 pm
Forum: TECHNICAL
Topic: Increased Power = Increased Accuracy?
Replies: 7
Views: 9534

Re: Increased Power = Increased Accuracy?

Gary Thanks for the reply. According to the Air Arms brochure, in the MPR 10m Precision, 'the firing valve is designed to be self-regulating'. But I believe the S400, on which the rifle is based, is non-regulated. So I'm not sure how they achieve this. It might be reasonable to assume that the 'regu...
by Mainliner
Mon Feb 07, 2022 4:56 pm
Forum: TECHNICAL
Topic: Increased Power = Increased Accuracy?
Replies: 7
Views: 9534

Increased Power = Increased Accuracy?

Does increasing power improve accuracy? I have an Air Arms MPR 10m Precision (a version of the S400). It comes out of the factory set at 5.15 ftlb. I'd now like to use it at 25m, so I've increased the power to about 11.5 ftlb. But it seems to be less accurate at the increased power (the grouping, ev...
by Mainliner
Sat Aug 14, 2021 10:59 am
Forum: TECHNICAL
Topic: S400 - Air Cylinder dumps all its air on removal
Replies: 2
Views: 2758

S400 - Air Cylinder dumps all its air on removal

I've got an Air Arms S400 (10m MPR Precision). Normally, when I unscrew the air cylinder, I just get a momentary 'phut' at about the half-way point. But now, when I unscrew it, it 'locks solid' at about the half-way point i.e. I'm unable to unscrew it any further, and it dumps all the air. Only then...
by Mainliner
Sat Feb 01, 2020 3:59 pm
Forum: TECHNICAL
Topic: Air Arms Alfa Proj Air Cylinder Removal.
Replies: 6
Views: 15310

Re: Air Arms Alfa Proj Air Cylinder Removal.

Here's an update to my last post: I've found the leak - It's a pinhole on the air cylinder itself. I'll try to seal it. My initial thoughts are Araldite. Can anyone suggest anything better? Here's a link to an image of the problem: https://i1053.photobucket.com/albums/s468/mainliner1/DSCN0620_LI.jpg...
by Mainliner
Thu Jan 30, 2020 12:08 pm
Forum: TECHNICAL
Topic: Air Arms Alfa Proj Air Cylinder Removal.
Replies: 6
Views: 15310

Re: Air Arms Alfa Proj Air Cylinder Removal.

' I've made sure the cylinder is empty but .........' Keith I suspect that my Alfa pistol is leaking air, just like yours, and I might well need to unscrew the cylinder and check the seals. How, exactly, did you ensure that there was no air left in the cylinder? The manual describes how to empty the...
by Mainliner
Wed Nov 29, 2017 11:16 am
Forum: TECHNICAL
Topic: Over-lubrication?
Replies: -1
Views: 3728

Re: Over-lubrication?

I have received the following information from Air Arms: 'The technical department has advised that spraying a degreaser of any kind is a bad idea. The fluid may get into the mechanism and cause rust issues. The action should be stripped down, cleaned, and re-assembled with the correct lubrication.'...
by Mainliner
Sun Nov 26, 2017 4:06 pm
Forum: TECHNICAL
Topic: Over-lubrication?
Replies: -1
Views: 3728

Re: Over-lubrication?

Peter Thanks again for your advice. I'll certainly investigate the Napier degreaser suggestion. Your diagnosis of the problem seems correct. The power output has definitely dropped off considerably - I can now see the pellets in flight! I actually used 'Glide' spray to lubricate the cocking mechanis...
by Mainliner
Sat Nov 25, 2017 9:50 pm
Forum: TECHNICAL
Topic: Over-lubrication?
Replies: -1
Views: 3728

Re: Over-lubrication?

Peter

Thanks for your input. I now have to consider how to clean the affected area. I'm thinking about using a solvent spray (e.g. brake cleaner) to 'rinse' the oil away - or will that make things worse?