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All Springer/NP/PCP Air Gun Discussion General > Engineering- Research & Development

PCP hammers - pistol vs slide

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QVTom:
First post for the new gate.  I hope it is appropriate :)

I have some PCP designs in the works.  These are clean sheet designs, not mods or copies of existing guns.

I'm looking for thoughts on external pistol type hammers vs the slide hammers used in most PCPs?  I'm especially interested in reliability and repeatability for the most consistent shot string possible.

External:
pros:  1) Can easily be de-cocked with out cycling action and double loading projectiles. 2) Gives a visible hammer cocked indicator.  3) looks realistic on replica style arms.

cons: 1) open to ingress of debris. 2) May get whacked and damaged in the field.

Internal slide:
pros: 1) possible easier to  modify and tune.  compression springs, spacers, guides etc. 2) protected from the environment.
Cons: ??

Tom

Cal:
The friction of a swing hammer will be the most consistent.

Easy enough to modify weight by adding or removing material from the thumb pad
Easy enough to modify stroke by adding or removing material from the striker face
Easy enough to modify valve actuation distance by adding or removing a spacer (o-ring) around the exposed stem.
Easy enough to modify spring preload if the action is designed correctly.

Hard to get the same level of trigger weight adjustability as a refined trigger group might.

Exposed hammers look and feel right!  Real rifles have 'em!

Rescue912:
I love hammers!  I have a few semi-auto PBs but still carry my single shot H&R Deluxe 95% of the time.  The transfer bar safety on their receivers is ingenious and I would love to mod one of their SB1 receivers into an airgun.  I've got a .50 barrel with a twist rate that would be ideal.

plinker81366:

--- Quote from: QVTom on November 26, 2012, 06:35:13 PM ---First post for the new gate.  I hope it is appropriate :)

I have some PCP designs in the works.  These are clean sheet designs, not mods or copies of existing guns.

I'm looking for thoughts on external pistol type hammers vs the slide hammers used in most PCPs?  I'm especially interested in reliability and repeatability for the most consistent shot string possible.

External:
pros:  1) Can easily be de-cocked with out cycling action and double loading projectiles. 2) Gives a visible hammer cocked indicator.  3) looks realistic on replica style arms.

cons: 1) open to ingress of debris. 2) May get whacked and damaged in the field.

Internal slide:
pros: 1) possible easier to  modify and tune.  compression springs, spacers, guides etc. 2) protected from the environment.
Cons: ??

Tom

--- End quote ---
how about this type?.. it has a swing breech with an external hammer

lloyd-ss:
I have seen a number of different types of springs used with external hammers, and I have to say that I like the look of an external hammer.  Do any of them have the ease of spring force adjustment that the conventional sliding hammer and spring do?
Thanks,
Lloyd-ss

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