All: Looks like this was hashed out a long time ago, but never made it into the rules or "official, published NROI clarifications", at least not that I can find (maybe it is an old Front Sight or something).
Relevant APPENDIX D4 — Production Division rules:
22 Specifically prohibited Please note that the absence of an item in the list of modifications and features prohibited modifications MAY NOT be construed to mean a modification is allowed. A modification is only allowed in Production Division if there is a rules clause or interpretation which specifically declares that it is allowed in the Division.
- 22.4 Magwell opening The longitudinal (front-to-back) dimension of the opening may be more than 1/4” greater than the corresponding dimension of a magazine. External flaring remains PROHIBITED.
UNLESS a modification is SPECIFICALLY authorized in the rules or SPECIFICALLY authorized in an official, published NROI interpretation, it is considered a PROHIBITED MODIFICATION.
PER THE RULES this modification is unclear at best and illegal at worst.
But, we have this unofficial and unpublished DNROI email clarifying the matter. If you have a link to a published statement, please pass it along.
On Mon, Jan 30, 2017 at 10:14 PM, Troy McManus <email@example.com> wrote:
As long as you don't create any external flaring, the inside of the magwell may be smoothed and contoured, rough edges removed, etc. Additions such as the Sevigny speedway are also allowed. These are considered internal modifications as long as they do not create any external flaring of the entrance of the mag well.
I wasn't familiar with the "Sevigny Speedway". It looks like most original web links, etc. are gone but I found this link from 12/2011 and a copy of an old post from our very own perennial favorite and USPSA Rules SME: Caleb at GunNuts.
http://gunnuts.net/2...vigny-speedway/ (note: Dead link and I can't find the article on the current web site)
The Sevigny Speedway
December 9, 2011
I’ve mentioned that I have all my Glocks modified by Southpaw Custom several times now. After trying guns with and without the Sevigny Speedway, there’s just no way I’d ever run a gun without it.
The Sevigny Speedway takes the “lip” out of the back of the Glock’s magazine well, increasing the effective reloading area by something like 25%. It’s named forDave Sevigny (duh) who uses the Speedway on his competition Glocks in USPSA Production, Limited, and the Pro-Am. Because the Speedway isn’t an “external” modification, it is legal for USPSA Production for the time being. For IDPA however, it’s considered an “add on magazine well” which means that having the Speedway on your guns automatically places them in ESP or CDP depending on caliber.
The downside to the Speedway is that if you lose the ability to attach a lanyard to your pistol. I wish I was joking, but the first time I talked about the Speedway, someone sent us an email at Gun Nuts HQ bitching about how he couldn’t apply a lanyard to a pistol that had the speedway. To each their own, I suppose. In all seriousness however, the Speedway is a permanent modification to your Glock. Unlike a grip plug which can be removed, the Speedway is forever. Since “custom” Glocks don’t exactly bring a lot of resale value, get the Speedway if you’re committed to keeping this gun for a long time. Of course, when you start doing reloads with a gun that has this modification you’ll want to keep it forever.
Adding the Sevigny Speedway corrects one of the few things I don’t like about Glocks – the restriction on the magwell due to that lip. It’s like buying skill because you’ll find yourself fumbling fewer reloads and sticking your existing reloads even faster. If you’re serious about running a Glock in IDPA or USPSA competition, you need this mod.