Gyrojet 13mm 2-Port


#1

Hi,

I have several 13mm 2-port gyrojets as shown in the photo below.

Previously, I have only see 4-port gyrojets. Is the 2-port version less common than the 4-port? Did the 2-port precede the 4-port version?

Can a gyrojet be sent through the US Post Office or does it need to go Parcel Post?

Any help and information would be greatly appreciated.

Thanks.

Heavyiron


#2

A Gyroject is small arms ammunition, and can’t be mailed. Parcel Post is mail. It can’t be sent that way. UPS or FED X is about it.


#3

It’s a long story. Right now, I’m on page 314 of my gyrojet book.

The two-port rockets came after the four-port versions, and are seen in 13mm (12.94mm average outside diameter) and 12mm (12.54mm average outside diameter) rockets. Your magnet will confirm that these are copper-plated steel.

Briefly, two young engineers came to Robert Mainhardt at MBA to announce that they had invented a machine that would drill four ports simultaneously. Didn’t work, but the machine drilled two, which was good enough. Mainhardt bought the machine for the 13mm Gyro-Flares and discovered that the two ports worked well with the rocket ammunition.

Gyrojet rockets are small arms ammunition. UPS or FedEx.

Mel


#4

John and Mel,

Thank you very much for the information.

Heavyiron