Quick question about magazines capped by method of rod welded onto the follower. If you have a 20 round M14 magazine box with a rod on the follower restricting it to 5, and a 5 round magazine box with a normal follower............ it seems like a prohibited device is almost asking to be made by simply swapping the followers. My friends M14 from Marstar purchased 8 years ago had 5 and 20 round magazines that could, through parts (follower) interchange, be remade into a prohibited device.
What happens when you disassemble all the magazines (the 20 and 5 rounders) for cleaning and the parts can be readily remade into a prohibited device? Are you in technical possession of a prohibited device at this point? Taking into account the 2011 R v. Cancade decision, it might appear so and you might be in some hot water if police walked in on you.