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 Post subject: Crosman (mendoza) RM422
PostPosted: Fri May 13, 2016 2:06 pm 
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Joined: Sun Jul 01, 2012 4:25 pm
Posts: 222
Location: HRM N.S.
Built with pride in mexico, sold with shame in Canada. :rolleyes:

I picked this up a while back at a give away price so I bought it. This little gun was apparently orphaned after only one year of production and now neither Crosman or Mendoza will acknowledge the existence of the RM422. :?
I can't seem to find much info on this gun. Most of what I found were older posts on this forum, and they were overwhelmingly negative. I did find some info online which was also negative and hinted at specific flaws and fixes. It looks like I have some leg work to do if I decide to improve or tune this gun.
It seems Mendoza grossly over stated the FPS of the RM422 and from what I gather the same is still true today with their current airguns. This one was rated @495FPS when new. Other issues were piston seal failure and a funky off center transferport on the piston chamber face where it lines up with the rear of the pellet at the breech :? .

My Pros:
nearly all steel and wood construction
good fit and finish
a bit heavy but shoulders well and nice balance
easy to cock
ambidextrous auto safety
trigger is acceptable
quiet

MY Cons:
discontinued production, making part sourcing a real issue
lack of detailed info from either parent company
short production run, resulting in very little online information. compounded by the fact that it was a detuned Canadian model
low power

I did chrony it today with these results using 22cal. Crosman Premier HP pellets

Shot #1- 362.2FPS
#2- 365.5FPS
#3- 352.8FPS
#4- 350.6FPS
#5-347.6FPS
*Note I gave it 2 drops of pellgunoil before testing and noticed a small bit of smoke after each shot indicating slight dieseling and therefore an intact piston seal.

My overall opinion is, it's a nice looking well made gun that is rugged and should stand the test of time. This particular one is still in good condition and seems to have seen little use. Some of the parts on Mendoza's current and past models of this gun should be interchangeable with this one, so parts should be obtainable. For the price I paid I am very happy with it. I think any young boy would love to have this as his first airgun, it looks and feels like the real thing. So I will probably leave it as is and pass it on to my grandson in a few years.
If I had bought this back in the day and paid full price for it, I would certainly have felt cheated.
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All comments, corrections, rants or raves are welcome.
Cheers

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Last edited by rangerll on Fri May 13, 2016 2:27 pm, edited 2 times in total.

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PostPosted: Fri May 13, 2016 2:14 pm 
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Joined: Sun Jul 01, 2012 4:25 pm
Posts: 222
Location: HRM N.S.
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"Quando omni flunkus moritati"


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PostPosted: Thu Apr 02, 2020 7:43 pm 
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Joined: Wed Apr 01, 2020 7:53 pm
Posts: 78
Location: Near Montreal, Quebec
Thanks for this write up! have one I bought probably 20 years ago. I learned a lot about my gun :D from your post cheers! Mine is still in great working condition and for basement plinking it’s a charm :) nice and quiet and plenty accurate for shooting in my basement or yard at 20-50 feet. I’d love to get a better trigger going on it somehow.

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Matt a.k.a. QuebecPlinker
Artemis CR600W .22
Mendoza RM422 .22
Crossman Backpacker .22
1970s Relum Telly .177
1970s Slavia Liberty .177
Crossman 357 .177
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PostPosted: Thu Apr 02, 2020 9:18 pm 
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Joined: Sat Oct 27, 2012 5:28 pm
Posts: 632
Location: st catharines ontario canada
I too have one that shoots a little faster, mine is in low 400's and as mentioned "great" for basement plinking. Mine has been meaning to be put back together but that trigger is a pita
Good backyard porch plucker

Steve

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PostPosted: Thu Apr 02, 2020 9:32 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 7019
Location: P.G. B.C.
Big plus, is it has a walnut stock in the day and age of beech.

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Daryl


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PostPosted: Fri Apr 03, 2020 5:13 am 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 1548
Location: Eastern Townships
Daryl wrote:
Big plus, is it has a walnut stock in the day and age of beech.


Yes, another reason I love mine! Don't remember too well, but I think mine is shooting in the low 400s, and very accurate with CPUM 14.3 gr.

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PostPosted: Fri Apr 03, 2020 12:58 pm 
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Joined: Sun May 20, 2007 10:26 pm
Posts: 374
Location: Any Town ONTARIO
This gun suffers from very small air volume. It makes little difference how 'hard' you slam that little bit of air, it will only go so fast.


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