No but mine started life as a 221FB.
CZ makes two magazine/bottom metal lengths for the 527. Same action and the bottom metal/mag's are interchangeable. You can order em from CZ.
204, 17Rem, and 223 are larger than the 222, 221, 22Hornet models.
Only difference in mine and a 222 is a plastic spacer in the magazine but I've heard (on the internet so take it for what it's worth) that the 17FB also feeds fine from the 222 magazine(without the spacer).
I've even heard of guys feeding the 17FB from the larger 223/204/17rem magazine's but again,,,, it was on the internet sooooooo?????
An aside,,,, I did have the magazine modified by RVB Precision but that was because of the way CZ's mag's hang down and interfere with balance (IMO). Nothing to do with feeding. The original held five. Mine holds three.
Last edited by FieldGrade; 08/04/15.
