Manual multyshot

I am thinking… I am about to make .30 EDgun Matador, first 40 guns will be single shot just to test everything, the valve, regulator, hammer and hammer spring, barrel, pellets etc. If everything goes well I should think about multyshot. To keep it at the same size as R3M is not possible — I will need to make completely new breach, that is expensive since I have no idea about demand for these guns. You should agree with me that is this caliber is quite specific. So, I thought that there is no problem to install the magazine to standard breach of R3M but take off the ling between the bolt and the magazine. So it will look like that:

1. Pull the bolt and open it.
2. Insert the magazine,
3. Close the bolt.
4. Shoot.
5. Pull the bolt back, cocking hammer.
6. Revolve the magazine manually.
7. Close the bolt.
8. Shoot.

It will be something between single shot and multyshot, easy to operate, faster then single shot loading.

What do you, guys, think about it?

Ed