Umarex RP5 pre-review

[gingernut]

Good to know.

But most shooters would want to use a silencer on the carbine?

I need to do a chrono test on my pistol with and without silencer.

[short-carabine]

Good to know.

But most shooters would want to use a silencer on the carbine?

I need to do a chrono test on my pistol with and without silencer.

This is an issue I want to use a silencer but it is clear the RP5 doesn’t like them. Some chrono figures with and without would be good. Is the pistol rifled or choked? The choke appears to be the issue.

[oldskoolzzz]

Cheers. This was a baseline test with a known quantity. I plan to try Superdomes, Accupell and maybe some Crosman HP without a mod fitted to get some comparison.

Ok cool 👍🏻 Keep us updated.

This is an issue I want to use a silencer but it is clear the RP5 doesn’t like them. Some chrono figures with and without would be good. Is the pistol rifled or choked? The choke appears to be the issue.

Does seem a strange one how a silencer is not only reducing muzzle report but also seriously reducing the power 🤔

[short-carabine]

Ok cool 👍🏻 Keep us updated.



Does seem a strange one how a silencer is not only reducing muzzle report but also seriously reducing the power 🤔

The choke slows the pellet momentarily and then instead of exiting free, it pushes pressure into a restricted vessel. Physics is not my strong point but I think I sort of understand why this is happening. I plan to try it out with a muzzle brake to see what sort of effect that has.

[gingernut]

Pistol has the same TG choked barrel.

I see JSR do a single shot tray as well as the 5 shot mags.

[short-carabine]

Pistol has the same TG choked barrel.

I see JSR do a single shot tray as well as the 5 shot mags.

Ah, then possibly the same effect will apply with mod/non mod setup

[oldskoolzzz]

The choke slows the pellet momentarily and then instead of exiting free, it pushes pressure into a restricted vessel. Physics is not my strong point but I think I sort of understand why this is happening. I plan to try it out with a muzzle brake to see what sort of effect that has.

I get the theory but slightly confused with how the silencer would cause ‘more’ choke effect to slow the Pellet down further

I would have thought soon as the Pellet exits the barrel regardless of silencer fitted or not it’s at x power as it leaves with the blast behind the Pellet being muted by the silencer.

Physics isn’t my strong point either but it’s certainly interesting.

[short-carabine]

I get the theory but slightly confused with how the silencer would cause ‘more’ choke effect to slow the Pellet down further

I would have thought soon as the Pellet exits the barrel regardless of silencer fitted or not it’s at x power as it leaves with the blast behind the Pellet being muted by the silencer.

Physics isn’t my strong point either but it’s certainly interesting.

Confusing, isn’t it?
All I know is that you lose about 3 ft/lb when you put a mod on. Never experienced this on any other gun, so am guessing this is down to the choke

[cozzamec]

There is a German site that sells an full shroud with no cut outs for these for 40 euro, I'm not sure if I'm allowed to post link, if not pm me.
Maybe this would dampen noise enough not to worry about adding an extra silencer?

[short-carabine]

There is a German site that sells an full shroud with no cut outs for these for 40 euro, I'm not sure if I'm allowed to post link, if not pm me.
Maybe this would dampen noise enough not to worry about adding an extra silencer?

I have been thinking along these lines too Can you PM me a link? The idea has possibilities