Occasionally I will contact the Daisy Museum for info on a gun made before the numbers could be read by anyone. Today the museum director Joe Murfin emailed a response to such a question about my model 104- the gun I have mentioned a number of times in this thread that started me modifying Daisy BB guns. Through a cool bit of serendipity it turns out the 104 was made on my 12th birthday.
And now for something completely different: After reading a little about the single pump smoothbore Daisy model 1910, I thought it might be fun to see if it could be modified to shoot harder than the ~300-310 fps it does stock. I got a diagram from Daisy CS and the 1910 looked a whole lot like an 880 internally. I have experience with the 880 so I went ahead and bought a 1910 and true to form, it shot 310 fps using Daisy zinc plated BBs. This just isn't enough to reliably hit the targets I have set up in the BY so I ordered a compression tube for the 880, the idea being the 880 tube might allow for a stroke increase to boost the power of the single stroke 1910. Nope- the 880 tube is actually shorter than the 1910. I did fill the dish in the top of the piston but it really didn't help.
While it was apart I verified the 1910's intake "valve" was nothing more than a plastic plug that replaced the valve an 880 uses to make the 880 a multi pumper. So I removed the 1910's plug and replaced it with the seal, spring and abutment used in the 880 to turn it into a multi pumper. Part number for these parts is 169910-000 Chamber seal kit, cost is $1.00 from Daisy. Everything fit and after reassembling it I tested the MV.
The new MV in fps is as follows:
Daisy Model 1910 in SPP mode
Daisy Zinc............
Marksman
310........................335
Daisy Model 1910 MV fps in MPP mode
Pumps...
Daisy Zinc..........
Marksman.........
880 w/Daisy zinc
1. ............246.....................285.....................262
2..............361.....................397.....................400
3..............436.....................466.....................475
4..............479.....................521.....................535
5..............525.....................554.....................590
10............610.....................656.....................735
NOTE- 2 or 3 pumps is the sweet spot and the majority of the time I use 2.
The Marksman BBs made quite a difference in MV in this 1910! Nothing was done to tighten the headspace and I know there’s a lot more than needed, so next time I go back in it I will set the headspace tighter. I expect to gain some MV but how much remains to be seen. It would be cool if it shot as hard per pump as a new 880, but that might be asking a lot.
It’s now quite usable at 2 pumps, and fortunately accuracy didn’t go away with the increase in MV. Even though it’s no longer a SPP, the difference in one and two pumps just isn’t a deal killer for me. And the ES is a lot tighter than when it was pumped more than once with the SPP valve in it. Oh, I also replaced the short buttstock with one from a new production 880 for more LOP.
So some may be wondering why bother with modifying a 1910 when an 880 will give higher MV per pump than the modified 1910? The reason for me is, the lever stroke of the 1910 is easier and quicker due to the short length and linkage ratio of the lever. It's just a flick of the wrist compared to the 880. The 880’s pump arm is much longer and travels a lot further per stroke to make the 880 lever effort more manageable at higher pump numbers. On the other hand, the 1910 at 10 pumps is downright stiff to pump and I do not recommend it on a regular basis.