The T.U.R.D Coming !
Just a pic of the Tactical Utilitran Rifle Design striaght from the Voleworks design dept. This is what ive come up with …. ๐
Its .177 , 15 round mag , collapsible stock , AR grip , pump action , shrouded , 70 shot regulated and at 70cm long.

I wanted to design a gun for the guys who do ” Ratting ” as its known over here ,so its a small take down type gun to shoot rats in barns. If i get the drawings finished in the next couple of weeks the first prototype should start soon arfter on my mates new CNC machining centers .
Ive been drawing on Auto CAD for weeks , and im now experiencing the joys of learning 3D CAD ( for this and my CNC mill).
So i thought id see what you guys like / dislike because its not going to be for sale in the USA …hehe !. ๐
So what do you think !
L8r all ๐
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Hi,
I put some things on “paper”:

-Piston releasing sear, hammer hits against it pretty fast, so it should be strong enough. Its back knot (6) should be measured so hammer will hit it (much?) before its backmost position. Then loading force should have some wider limits for proper cycle.
Magazines back point from pellet chamfer will set a minimum travel for loading system and I think that magazine and pellet chamfer should be as close together as possible.
-I like more BSA Super 10 pellet feeders head shape than Hornets shape (3) on picture. It needs more travel, but airflow might be better and it is easier to make. It also โpenetratesโ better into the magazine.
-One solution for locking sliding pump could be ball locking pin mechanism inside probe shut: http://www.drillspot.com/pimages/306/30600_300.jpg
Inside block right under barrel for example (4). Take those T-handels off, fix front handle bar straight into the blue pin and other head (“yellow”) into the probe connection.
-Springs definitely need some guide (position 1), if you use it as semi-auto, those will cause trouble without guide. Make guide for all the spring travel.
-Barrel joint should be long enough.
-Safety (7?) will be โsaferโ if it will disable middle or piston releasing sear function or even hammer moving. This way gun tolerate more impact and it wonโt shoot by itself.
-Think to make some bushings on hammer and probe bore. Soft aluminium block needs hard anodizing and sometimes it wonโt be enough. Some fellow got ruined his FX Revolution hammer bore for some reason, hammer chopped bore while shooting.
http://www.munkuvat.org/kuvat/60028.jpeg
http://www.munkuvat.org/kuvat/60029.jpeg
http://www.munkuvat.org/kuvat/29342.jpeg
Bushings inner diameters are easier to make smoother on lathe than trying to machine smooth bore into the block. Then bores end should be like drill shape, bushings could have same shape, this way you can use โstandardโ drill bit, if there is enough room.
-Hammer could be symmetrical, no milling needed.
-Make trigger system as removable unit, easier/faster to take apart/overhaul.
-Pin (5) needs some sealing.
-If this was semi-auto with this trigger, it will let gun work like full auto. Hammer/loading system will cycle as long as trigger is pulled. It probably stops when pellets end or it won’t work at all. All loading system components will move no faster than hammer and when they move together, hammer might hit too slow to opening valve. Valve releases too small amount of air for proper cycle.
-Try to eliminate pellet double feed possibility. Behind pellet affects huge pressure, same pressure what pushes pellet towards muzzle pushes pellet feeder (probe) backwards. In normal situation pressure behind pellet wonโt be bigger than working pressure. You can calculate how much it will push probe backwards if you know working pressure/probe diameter.
Pressure will drop fast when pellet moves, but if something blocks barrel, it will blow all air out via magazine/probe area. Therefore is important to be carefully with double feed, especially with semi-auto system. Like powder burning guns have bleeding hole in their action, this could have bleed hole/bore somewhere between magazine and pellet chamfer.
-If gun wonโt have probe shut lock and it works as semi-auto, ensure junction (2) in (pellet feeder?) probe, it must be very strong (secured with glue). For example, FX Revolution approximately 70-90% of loading cycle forces comes from pressure behind pellet, 10-30% from muzzle wastage air.
If that joint (2) is too weak (and its components), it wonโt last long.
When pressure will push probe backwards, probe will move all loading components weight via this small pin (jointing 2), against all springs. If gun takes some extra air (from muzzle area) for loading, it always comes โtoo lateโ.
-I think that working chamfer should rather be too big than too small. Regulator must have small holes, and if working chamfer โdumpsโ most air every shot, then its filling might takes too long (semi-auto). If you make bigger holes into regulator, it will work too fast (then internal forces will be too big).
-Tank should be removable when pressurized, helps overhaul. If not possible make some pressure bleeding hole.
-Use magazine cheap enouhg , prototype never gives no mercy its components.
I’ll hope some of this helps!