Was really excited to hear about the spigot adapter that MPA came out with for the Magnetospeed so you could free float the chronograph and not have any POI shift when shooting or doing load development. However, the one they came out with was only for the full size V3 chrono and not the Sporter. I'm assuming that's because the Sporter model doesn't have enough room on the top to attach a rod and still have it get close to the barrel. The only way to make the Sporter work would be to mount from the bottom. I spent a bit of time figuring it out and I think I've got a winner. Really happy with how it turned out.
Parts list:
Quick Connect Picatinny Rail Adapter (knockoff of ADM style clamp) - $10 on ebay
Aluminum L channel - $4 from Home Depot
Screws, Nylon lock nuts, washers - $2.50 at the local hardware store
Sling stud/swivel - already had on hand
The QD clamp was a two piece clamp with screws already countersunk for the pic rail attachment. (see shortened ebay link here for the one I got - https://tinyurl.com/ya49qpu7 ). I removed the screws and drilled all the way through the picatinny rail to fit my longer replacement screws. The notched pic rail section rests against the edge of the L channel to help prevent twisting. I added enough washers to give me the proper standoff. At the other end I drilled a hole through the L channel to fit the screw from the sling stud, and located it so that the L channel rests against the side of the Magnetospeed to keep it from twisting. You can use the screw knob from the magnetospeed since it is the same thread pitch and also uses a sling stud swivel for the strap.
Clips on/off in seconds, really light weight, and is very rigid due to the L channel material which prevents twisting and flex.
Hope this is helpful to someone else. You should be able to make one in under 30 minutes with just a drill and a hacksaw to cut the L channel to length.
Parts list:
Quick Connect Picatinny Rail Adapter (knockoff of ADM style clamp) - $10 on ebay
Aluminum L channel - $4 from Home Depot
Screws, Nylon lock nuts, washers - $2.50 at the local hardware store
Sling stud/swivel - already had on hand
The QD clamp was a two piece clamp with screws already countersunk for the pic rail attachment. (see shortened ebay link here for the one I got - https://tinyurl.com/ya49qpu7 ). I removed the screws and drilled all the way through the picatinny rail to fit my longer replacement screws. The notched pic rail section rests against the edge of the L channel to help prevent twisting. I added enough washers to give me the proper standoff. At the other end I drilled a hole through the L channel to fit the screw from the sling stud, and located it so that the L channel rests against the side of the Magnetospeed to keep it from twisting. You can use the screw knob from the magnetospeed since it is the same thread pitch and also uses a sling stud swivel for the strap.
Clips on/off in seconds, really light weight, and is very rigid due to the L channel material which prevents twisting and flex.
Hope this is helpful to someone else. You should be able to make one in under 30 minutes with just a drill and a hacksaw to cut the L channel to length.
