I did mine, the bottom of the mag comes out , on either side of it you will see 2 plastic tabs located on the sides. Get something that fits in there and pop em in , you need to do them
the same time, a bit fiddly but not too difficult.
after you pop that out you can take out the spring assembly bits and pieces. then you are away,
you will need to shorten your bolt stop as well otherwise the bolt wont pick up your next round.
easiest way is to buy one,
I cut mine down and tigged a blob on the end (its hollow) then filed it to shape, works fine and was pretty easy.
I can seat the 140s waaay out now to fit in heaps more powder.
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