"... Why put a $50.00 saddle on a $5.00 horse? "
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Because a lot of people don't have an extra $700+ laying around to invest in a BP rifle.
A lot of people
do have T/C rifles which they
can afford to upgrade.
They are not trying to please the PC crowd or those who can afford to put out big bucks. They just want to improve what is a very nice rifle.
The T/C lock, trigger and barrel are all quality parts which will make a very reliable, good shooting rifle. Using the existing trigger guard, butt plate and nose cap will also save the folks $40+ if they like the existing parts.
Some other people just want the experiance of working on their own gun as a precursor to building a more advanced rifle. A T/C rifle will give them the hardware they need to do this.
Almost none of these people are interested in making something to sell for a profit, so the end value of the rifle is the satisfaction of having a gun which was basically made by them, not the money they can make by selling thier gun.
I have restocked a TC and quite frankly, it is one of my favorites for shooting holes in targets even though I do have a few other guns I have built:
As for cutting pockets etc for casting nosecaps, I am having trouble visualizing exactly what is being proposed. I will say that the method of drilling holes thru the stock to allow the cast material to lock itself in place has been used for years and works very well. It does not need screws or any other thing to lock it in place.
To see a gun which had this done refer to the T/C Hawken restock (mentioned above) by using the Forums search engine and entering the word "cerrobend" and "zonie". It will bring up several posts which cover pouring a nosecap.