Lyman GPR lock

[huntsman247]

So how are they? Any issues, good spark? What can you tell me? Thanks in advance

 

[cardcutter]

My GPR sparks great. i have had mine for over ten years and never had an issue with the lock.I do have a problem with the set trigger being really hard but the rifle shoots great.

 

[ebiggs1]

If I had to list the problems with the Lyman GPR it would be: :hmm:

1. Touch hole liner
2. Lock
3. Trigger
4. Stock

The touch hole liner needs replaced as soon as you pick up the rifle. It is simply awful as it comes.
The lock works but can be so much better for very little effort. The trigger also “works” but after you use a Davis, it becomes oblivious. They leave too much extra wood on the stock but if you like it, OK!

Lyman barrels are great! :thumbsup:

 

[rancher]

The lock is ok, but so far I have drilled the touch hole out to 5/64" and added the Davis Deerslayer triggers. What a major upgrade the triggers are. The ignition is also very good now.

 

[Greenjoytj]

I'm still using the ome cut agate flint just because it still works every time I pull the trigger. I find the reach to the trigger a little long, it feels more natural and comfortable to place your finger on the set trigger. Setting the set trigger takes huge effort to get the click sound of the set trigger activating.
Without setting the set trigger the front triggers native pull weight is very heavy and the trigger adjustment screw seems to do nothing to effect the pull weight.
Firing with the set trigger set, the trigger pull is very light.
The stock around the cheek rest is a little club like too much wood was left on, but it could be modified by a handy owner.
I installed an RMC vent liner straight away it works good.

 

[ebiggs1]

That screw doe not and isn't supposed to adjust the trigger let off weight.

 

[Randall Slemp]

The lock on mine was a little finicky...no matter. I had some flashes in the pan as I was getting the kinks worked out. I did drill the touch hole liner to .070 after first enlarging and trying 1/16 and .067 drill bits. As E.Biggs has indicated in one of his posts, you do lose some velocity when you enlarge the TH so I just went slowly and settled on .070 which seems to have solved the FITP problem. But as some have stated, their rifles have been problem free from the start. I'm sure some of my FITPs were due to getting my loading/swabbing technique worked out. I explored upgrading to an L&R lock and Davis triggers but have decided to stay for now with the factory lock/triggers as they seem to be improving over time and are working just fine.

I love my .54 GPR and thanks to E.Biggs and others on the forum I am learning to work through my few start up problems and am enjoying the journey. I personally think the GPR is the best buy for the money for those on a budget entering the flintlock world and trying to balance price with quality and historical era looks and styling. Just my opinion for what it's worth.

 

[jethro224]

Drilling the touch hole out to 5/64 is a great improvement.

ebiggs idea of installing the new T/C cock makes a vast improvement on lock geometry.

The Davis triggers are excellent and well worth the $40 or so they cost.

:idunno: I like the stock.

I personally think the GPR is the best buy for the money for those on a budget entering the flintlock world and trying to balance price with quality and historical era looks and styling. Just my opinion for what it's worth.

I agree with Morningman.
And it won't be too hard to sell later if you decide to upgrade to a full custom.

 

[huntsman247]

Wow, I appreciate all the responses. Gives me ideas as to what I need to look for. Thanks all

 

[Birddog6]

I have had 3 of them & no issues. Drilled out the vent liner to 5/64" dia & coned it on both sides. As far as reliability, never had an issue. Did everything it should for a mass produced rifle. Had t inlet the lock a tad deeper on all 3 to get the flashpan up against the barrel. I never changed any parts on the rifles & shot thousands of rounds thru them.

IMHO, The problems occurring with some people with the the locks, is not the lock, it is the person learning how to make flintlocks work reliably. ALL of them have their pet peeves & quirks.... You have to learn them.

9 out or 10 people I see having ignition issues at the Territorial Matches, are shooting percussion ignition. The guys shooting the flintlocks learn them & seldom have an issue.

Keith Lisle

 

[jethro224]

Going back and re-reading my post I thought I should add a couple things...

Drilling the touch hole out to 5/64 is a great improvement.

ebiggs idea of installing the new T/C cock makes a vast improvement on lock geometry.
With the stock hammer configuration the flint strikes a bit low on the frizzen. It works but could definitely be better. Otherwise the Lyman lock works fine.

The Davis triggers are excellent and well worth the $40 or so they cost.
The set trigger on the Lyman lock is a bit hard to pull but the triggers are not that bad.

:idunno: I like the stock.

And the barrels are good. Most take a bit of breaking-in. All I have had experience with were quite accurate.

I personally think the GPR is the best buy for the money for those on a budget entering the flintlock world and trying to balance price with quality and historical era looks and styling. Just my opinion for what it's worth.

I agree with Morningman.
And it won't be too hard to sell later if you decide to upgrade to a full custom.

 

[courdebois]

Mine shot half not bad,but i did not like the liner,i took it out,metric threads,dam,got a 5/16" bolt,drilled out the touchhole and threaded it to accept bolt,finished the touch hole to .070",you have to be careful of the length as the barrel has a patent breech,since i started i mite as well change locks,the track catalogue has pictures full size,got one that fit,you have to make sure the pan is correctly positioned,now a have a 54 flinter with a a lr lock,oh eh i browned the barrel ,shoots like a house on fire,i probably did not have to go that far,but i did just that with a traditions penn an it worked out soooo why not

 

[Grey Hawk]

I have a .50 cap and a .54 flint and I am appearently one of the lucky ones, Out of the box,cleaned it, then cleaned it again then at least one more time(all the GPR's have a grease type coating in the barrel) anyway, loaded, aimed, fired. adjusted my sight a little, reloaded.....Wham...I am very happy with the GPR, also picked up the Hunter barrel (faster twist) for bullets.... :2

Grey Hawk

 

[ebiggs1]

Just to clear somethings up. :shocked2:
The GPR “works” as it comes. That said, it can be made better. Much better. The first thing you should do is throw away the touch hole liner and install a good aftermarket or at the very least drill the factory one to 5/64th. This alone makes the gun way better and not only work but it will work more reliably.
I don't care what some guys say, they have flashes in the pan from time to time if they have not altered the touch hole.

The second thing is to replace the cock with a TC new version. Now that good gun is a really good gun.

Go a little further and replace the trigger with the Davis and thin and reshape the stock and you have as good a gun as anybodies. :wink:

Lastly you can replace the lock entirely with the very good L&R RPL. Now we'er talkin'. :thumbsup:

But, yes, the gun will shoot as it comes. Poorly, but it does shoot. Cleaning is mandatory, BTW.

 

[Et2ss]

I have limited experience with flinters (Have only fired 3 or 4 different ones) but I must say my GPR has given me no problems whatsoever. I was actually impressed with it as there was no hesitation between tripping the sear & the charge going off. It was as fast as my underhammer! No hesitation whatsoever. Now if it does develop the above mentioned problems & will try some fixes but for now there is no doubt in my mind & can drop whatever I am shooting at this season.

 

[ebiggs1]

I am happy for you but that has not been my experience with them, nor has it been the experience of others from the PT's I have gotten.

 

[Trot]

My Lyman lock has also worked well from the start. The touch hole was another story, after enlarging the hole it is also good now.

 

[huntsman247]

Nice feedback everyone!! Thinking about hooking up with the kit. Thank You