Crosman Air Pistol Owners Forum

Crosman air pistol - General => Crosman air pistol - General discussion => Topic started by: UKairgunner on June 17, 2016, 08:46:03 PM

Title: weighting the insides of pistol grips
Post by: UKairgunner on June 17, 2016, 08:46:03 PM
Ok ,i like the simple stock look and all my mods have been  mostly inside,the new metal breech has a red dot and i use a large quality UK made moderator  which keeps the nuisance sound down.
But using a big moderator ,even with   with the stock 7" barrel, its front heavy  . 
Now i think a heavy pistol is better  for cutting down hand "shake" and im thinking of casting lead weights to fit in the recesses of the plastic grips. Ive made moulds/patterns  and cast aluminium before at college   and im thinking of using wax lost wax  into plaster of paris  then cast lead

anyone any thoughts of the idea of a heavier grip area  or the practical side of casting
Title: Re: weighting the insides of pistol grips
Post by: Brutuz on June 17, 2016, 10:25:11 PM
Yep this is what I did in 2009 http://www.crosman-air-pistol-owners-forum.com/board/index.php/topic,351.0.html (http://www.crosman-air-pistol-owners-forum.com/board/index.php/topic,351.0.html)

And another pistol I used sanitary kit to fill the grip cavities
Title: Re: weighting the insides of pistol grips
Post by: RinCG on June 17, 2016, 10:31:11 PM
I've used duct seal for more than just shooting at.
(http://i25.photobucket.com/albums/c54/R6j6B/duct%20seal_zps2fg5ykfe.jpg)
I've used it as a synthetic stock noise dampener also. Adds a good deal of weight also.
May check into it.
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 17, 2016, 11:25:06 PM
well Brutz..thought id ask you what "  sanitary seal " is before i type it in my search engine......im sure the Missis checks my posts( she can kick off more than GCHQ on dodgy web searches i imagine )
Title: Re: weighting the insides of pistol grips
Post by: Brutuz on June 17, 2016, 11:35:47 PM
Kit that seals showers and such
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 17, 2016, 11:54:16 PM
so after thinking about it it seems a good idea
im gonna look at mixing fishing split lead shot with epoxy resin and setting it into cling film "in situ",when its set i can simply pop it into the cavity...this might be a lot simpler than melting lead and casting.

I might do this in 2 parts per side of grip  (one in the frame ,one in the grip) so its easy to fit

the question for Maths students might be what size of fishing split  shot gives the maximum density per volume..ignoring the film of epoxy holding all the balls of lead together ?

il post pics if ever i get it sorted along with weights
Title: Re: weighting the insides of pistol grips
Post by: quickster47 † on June 18, 2016, 12:57:21 AM
I used a couple of tubes of 'Liquid Metal Filler' on a set of grips and that stuff worked pretty well.

Carl
Title: Re: weighting the insides of pistol grips
Post by: WyoMan on June 18, 2016, 05:31:39 AM
Spheres of the same size will densify to about 2/3 of the "voidless" unit weight - meaning 1/3 of the total volume is air voids.
(http://i1249.photobucket.com/albums/hh508/WyoMan/Webley%20Alecto/gframe_zpsbe244619.jpg) (http://s1249.photobucket.com/user/WyoMan/media/Webley%20Alecto/gframe_zpsbe244619.jpg.html)

I used epoxy (slow setting and low modulus) with chilled lead shot #12
I painted the sides and bottom with the epoxy, poured in the shot, and then poured in the epoxy.

It really helped balance the gun  :-*
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 18, 2016, 09:13:22 AM
thanks for the 2/3 rds rule...it would be a lot of work casting to get an extra 1/3 weight
im gonna try using lead fishing shot but setting it first into the hollow cavities in the stock grips to give them a better less cheap feel and enabling me to put on wood grips later if i change my mind
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 19, 2016, 07:33:02 PM
Done.

1 ,tested balance point of pistol which was just in front of the screw in front of the trigger{ balanced pistol on wooden dowelling)
2 decided i wanted new balance point on my finger when its on the trigger
3 tested small bags of lead shot taped on the grip till it balanced at my desired point
4 split this weight into 2 and mixed with a little epoxy to bind the small lead shot together and poured in insides of grip
5 pre checked that it wouldn't interfere with refitting  and tested refitting as the epoxy went"green" so if it didn't fit i could remould it quickly-
6 after it had set tested balance again....perfect

the total  weight of both my grips including the original grip plus epoxy and lead shot is now 275g,this suits my pistol as its fitted with a large UK moderator which ,whilst making it very quiet ,caused it to be nose heavy

also now the grips  dont feel so hollow with a nice solid clunky ring to em when i tap em!

total cost about £4

well chuffed with it now ,feels like im not trying to stop it drooping and surly less shake
Title: Re: weighting the insides of pistol grips
Post by: mudduck48 on June 19, 2016, 08:20:51 PM
Sounds like you got it figured out. How about some pics? :-*
Title: Re: weighting the insides of pistol grips
Post by: Tater on June 20, 2016, 10:30:02 AM
Quote from: mudduck48 on June 19, 2016, 08:20:51 PM
Sounds like you got it figured out. How about some pics? :-*

Yeas, nice job. And we love pics.
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 20, 2016, 04:24:13 PM
Ok a pic
not a very photogeneic pic,the thing was to steady my shaky hand and take the point of balance back to my trigger finger.

A and B mark before and after,i droppped of one grip but its only full of lead shot and epoxy sprayed up with black car paint.
luckily with the 2240 the usefull cavity is in the grips so if i ever want wood grips  its no problem

If the pic of the moderator is a problem moderartor please tell and ill remove it,also am i allowed to talk about the moderator? its an over the counter UK bought item on a UK legal airpistol

if pic dont load ill sort it soon

cheers
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 20, 2016, 04:29:50 PM
pic at last
Title: Re: weighting the insides of pistol grips
Post by: mudduck48 on June 20, 2016, 04:59:06 PM
Looking good. :)
Title: Re: weighting the insides of pistol grips
Post by: quickster47 † on June 20, 2016, 08:05:11 PM
Well, they look like they came out alright.  Especially if you got the balance point where you wanted it to be.   :-*

Carl
Title: Re: weighting the insides of pistol grips
Post by: Tater on June 21, 2016, 05:59:34 AM
Good mod sir.
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 21, 2016, 08:58:16 AM
Yes im very pleased with the results.If you use a  2250 balance might not be an issue as your other hand would  naturally be on the front stock so counteracting any imbalance.But if your shooting a 2240 with both hands around the grips and with a longer barrel and sights/uv lights etc attached it might be an idea.
As ever I am guided by function deciding form
Title: Re: weighting the insides of pistol grips
Post by: Chris79 on June 22, 2016, 10:37:32 AM
Hi mate great idea and one that I'm going to use once I have built my 2240 up, what mod is that? is it pretty quiet ie how does it compare to unmodded and where can I get one please?  :-*
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 22, 2016, 06:44:02 PM
hiya mate
Its a swift "stumpy" designed and made by Richard Pope, a Birmingham gunsmith/precision engineer.
They are popular in the UK  for HPA air rifles and FAC air rifles

Because of this they have recently been counterfeited  so you should contact him to check approved suppliers and you can also pick one up from his workshop direct in person for £40,mine is multi chambered with separate screw on sections,its fine engineering from the city which invented engineering and makes a huge difference to the noise

ive not got a sound meter so i cant give any Db figures for reduction but its considerable

his site is   http://www.swiftprecisionrifles.co.uk/ (http://www.swiftprecisionrifles.co.uk/)

if im not allowed to post about this please tell me and ill remove this post

Title: Re: weighting the insides of pistol grips
Post by: quickster47 † on June 22, 2016, 08:51:45 PM
Quote from: UKairgunner on June 22, 2016, 06:44:02 PM
if im not allowed to post about this please tell me and ill remove this post.

Your post is okay.  We are an international forum so the rules are not too hard-lined regarding information like what you posted.

Carl
Title: Re: weighting the insides of pistol grips
Post by: UKairgunner on June 22, 2016, 09:13:40 PM
thanks Quickster
im up to speed with the politics of the USA situation as regards moderators, but i just was cautious because of the American members online and any grief i might cause them/you/this forum

thanks
Title: Re: weighting the insides of pistol grips
Post by: Chris79 on June 22, 2016, 11:23:39 PM
Thanks UKairgunner!