Bob Roller Lock

[runastav]

Hi all! I have a Pedersoli Gibbs in my shop for a litle servise, and lucky me the rifle have a Bob Roller lock :)Beautiful lock I must say!
Runar

[Bob Roller]

That lock was made because those that came with the had a "fly" that created a hazard.When cocked,the 2nd "click"should be the sear engaging full cock.*When the hammer was released it would and did fire the rifle.
Pedersoli did a good job with the rest of the gun but did not pay enough attention to the Brazier or Stanton locks that were common on the English originals.My lock mechanism was made to accomodate the existing plate and I did retain the sear spring that came with it. This is my mechanism that I used in about 99% of all my caplocks and it was easy to adapt it.The lock has been modified by the maker in Italy and I made no more of these kits.
Thank you,Runar for showing this one.
Bob Roller
* In other instances the hammer had to be pulled back beyond fully cocked and when the 2nd click was heard and the hammer releaseda shot was certain.

[multifasciatus]

Nice
I am now the lucky owner of this rifle/lock
Nice work Bob, and the same to you Runar!
Here is a 100m prone/sling grouping.

Aj

[Scota4570]

The screw to capture the mainspring is clever.  Is there any downside to doing it that way?

[Bob Roller]

That screw was how Pedersoli captured the upper limb of the mainspring and I made by own spring to use it.
As I recall now,I made the lower limb longer for a smoother operation and to spread the stress over a longer area.I was surprised at the interest in this parts kit but it kept me busy and then that was a big help.
I see no downside to using this idea.
Bob Roller

[Clark Badgett]

The screw captured main spring was common back then.

[alacran]

Good shooting!

[Bob Roller]

The screw is a production shortcut found on modern work like shown here.The mid 19th century locks had solid bolsters to capture the upper limb of the mainspring.I have made lock plates with a screw like this but only to test springs and  not for the sake of a fast sale or easy production.I don't think I have any of them even to show.This is a good way to make a lock IF no milling machine is available and there is no difference in performance.
Bob Roller

[Daryl]

Nice
I am now the lucky owner of this rifle/lock
Nice work Bob, and the same to you Runar!
Here is a 100m prone/sling grouping.

Aj

Looking pretty good at this point.  Getting used to the rifle and loads will likely improve the groups even further.

[Clark Badgett]

The screw is a production shortcut found on modern work like shown here.The mid 19th century locks had solid bolsters to capture the upper limb of the mainspring.I have made lock plates with a screw like this but only to test springs and  not for the sake of a fast sale or easy production.I don't think I have any of them even to show.This is a good way to make a lock IF no milling machine is available and there is no difference in performance.
Bob Roller

I'll agree that the screw secured main spring seems to be an economy measure, it's however far from modern. I've seen it used on English ordnance locks and trade gun locks, to name a couple examples off the top of my head.

[Clowdis]

Hey Bob! What's the screw underneath the sear?

[Bob Roller]

That is a stub length screw that only fills a hole in the lock plate for cosmetic appearence.
Bob Roller

[Clowdis]

That is a stub length screw that only fills a hole in the lock plate for cosmetic appearence.
Bob Roller

OK, I thought you might have a super secret sear adjustment mechanism that you might share with the rest of us.