Gun store Shooting Locations It is currently Thu Jul 27, 2017 4:56 pm

Rules Brads Guns RA I5 Guns & Ammo Killer Innovations WAC
WGO Chat Room Rehv Arms LPG Pintos
Gear COUNTYLINE WCA Fortis 2A Ind.
Calendar





Reply to topic  [ 9 posts ] 
 Review: The New Chip McCormick RPM 10-round 1911 Magazine 
Author Message
User avatar

Location: Wabash, IN
Joined: Thu Sep 11, 2014
Posts: 32
Real Name: Josh Smith
05/31/2017 Update:

Hello,

Chip McCormick called me today. We talked. He is a very nice, very likeable guy. He has my respect.

It turns out that the follower is supposed to be offset like that. I was wrong in straightening it. It enhances performance, allowing maximum slide lock lobe engagement while at the same time maintaining minimum tolerances. The non-skirted follower allows for the absolute largest spring to be used, providing better function. I've personally experienced fail to lock on empty with Shooting Star magazines, and I'm very glad Mr. McCormick addressed this issue in his line!

*However, the magazine is tested in the real world to function under harsh conditions, having been tested in the Desert Wars among other areas.* It was specifically designed to get at least as dirty as I got it and continue to work.

So, I'm sending this mag back for Mr. McCormick to study. It shouldn't have failed and he needs to know why. I'm not so much concerned about Mr. McCormick "making it right" since the mag functions just fine now. Being in the industry, I do understand how manufacturing mistakes can happen, and how there is a constant effort to keep these to an absolute minimum. I want to see these refined and improved even further. I believe in this design more than ever: Chip McCormick is an extremely knowledgeable individual, and I know he can do even greater things with 1911 magazine design than he's done thus far. He cares about his products in the same I way I care about mine. Excellent guy.

I'll update this thread periodically. I'm extremely impressed with Mr. McCormick and his company.


------
The new Chip McCormick Railed Power Mag is an excellent design, addressing several key issues which have plagued greater-than-seven-round 1911 magazines since they were first tried.

Among the most significant changes, the feed lips are folded. McCormick chooses to call these "rails". Whatever the name, they provide unparalleled toughness and the ability to slam the full magazine home on an open slide without the fear of spreading the feed lips.

This allows the other two other innovations, those being the full-power mag spring and full-length follower leg.

As you may know, most extended magazines do not use full-power springs as found in standard seven-round magazines. McCormick does on the RPM magazines. When eight-round magazines were introduced, they were generally seven-round mag tubes modified with a Devel follower and smaller diameter (weaker) magazine spring. These were compromises which allowed an eighth round to be squeezed in. These magazines still did not seat well on a closed slide, at least in my experience, due to that eighth round allowing absolutely no more room.


I found out about the full-length follower when I was troubleshooting (more on that later). Though a modified Devel design, a standard GI dimpled follower fit and functioned fine in the 10-round magazine I tested:

Image


The length of the RPM tube allowed a full compliment of 10 rounds even with the dimpled follower. The only caveat was that, like the old seven-round magazines with increased capacity to eight rounds, it was difficult to seat on a closed slide.

It's interesting in that the modified Devel follower that is the RPM seems to exist only to provide easy seating of a full mag on a closed slide.

Shooting with this magazine was interesting. I started off with 11 230grn Hornady +P XTP defensive loads. These ran fine.

I moved on to a couple-few mags full of 230grn handloads. These were comprised of Lee Truncated Cone 0.452" traditional lube boolits over 4.5 grains of 700x. Again, these ran fine.


Then I grabbed a box of these:

Image

There were over 200, 200grn Xtreme Plated SWC handloads in that box. The first few mags ran fine, and then I began experiencing malfunctions, two per magazine, at predictable points. The malfunctions were partial feeds. A firm slap on the magazine (first part of the tap-rack-assess-bang drill) allowed the slide to return to battery under spring power.

I could have crimped those handloads a bit more. However, since they're plated and not jacketed, I like to just kiss the bell off the case mouth and nothing more. I'm sure gunk in the chamber contributed to the stoppages, but it wasn't completely at fault.


Both gun and magazine were filthy when I was done:

Image

Image

Image

Image


I took the opportunity to detail strip my 1911, and then moved on to the magazine:

Image


I noticed uneven contact of the follower with the mag tube:

Image
Image


Upon cleaning, the issue became obvious:

Image
The follower was bent!

I tested the tube with a known-good GI follower, pictured above. It ran just fine.


I then reinstalled the RPM follower and took a picture so that I could easily see where it was dragging:

Image


Here I should note that McCormick would have made this right. However, this was a new toy and besides, I like fixing things myself. I bent it to where it should have been:

Image

Image

I also put a mirror finish on all follower-to-mag tube contact points, but neglected to snap pictures.


Today a grabbed a box of these from the shelf:

Image

Lee 200grn SWC, hard cast, tumble lube, over 4.5 grains of 700x.

I ran 50 or 60 of these through the magazine along with a few of the aforementioned truncated cone loads. All functioned fine over a wide range of stances, including modified Weaver and Isosceles and single hand target hold. I tried limpwristing, shooting the gun upside down for a couple magazines, ghetto style... I couldn't get it to choke.


Overall, I think we have a winner. I like it. McCormick needs to watch the QC on the followers a bit more carefully as not all folks are willing to get in there and fix it, but beyond that, I like the mag.

If I had my 'druthers, I'd choose a metal plate reinforcing the plastic base plate. There is a metal plate there (which, incidentally, interchanges with Wilson), but it's only retained by the plastic baseplate and not the magazine itself.


Also, a dirty gun is a happy gun:

Image


I'm sure I left something out, so if you have questions, please ask.

Regards,

Josh


Last edited by Josh Smith on Wed May 31, 2017 12:26 pm, edited 1 time in total.



Fri May 26, 2017 6:51 pm
Profile
Site Supporter
User avatar
Site Supporter

Location: RENTON
Joined: Fri Mar 25, 2011
Posts: 6570
Real Name: John
Helluva review! Well done sir.

_________________
NRA RSO


Fri May 26, 2017 7:56 pm
Profile
Online
Site Supporter
User avatar
Site Supporter

Location: Duvall
Joined: Sat Jan 5, 2013
Posts: 9288
Real Name: Ace Tenemem Reroader
Thank you.

_________________
Charlie don't surf for his hamburger Momma


Fri May 26, 2017 8:31 pm
Profile
User avatar

Location: Wabash, IN
Joined: Thu Sep 11, 2014
Posts: 32
Real Name: Josh Smith
Thank you, Gents.


Wed May 31, 2017 12:27 pm
Profile
User avatar

Location: Wabash, IN
Joined: Thu Sep 11, 2014
Posts: 32
Real Name: Josh Smith
Hello,

Photobucket unexpectedly decided that hotlinking may only be done for paid accounts now.

I have no problem with this. I generally pay for Photobucket, but had not renewed yet this year. However, Photobucket caused a lot of problems by not warning its users in an effective manner. I personally saw no warning.

I'm moving hosting to smith-sights.com until I decide on another dedicated picture host. I've not disappeared. Please bear with me. I'm not the only one effected by this.

However, this illustrates why centralized storage is a problem. This Photobucket trick is reminiscent of ransomware ("Pay us money and you can again access your files".) It's not exactly the same because I can still access my files. I just cannot give remote access to these files without paying.

This effects everything I've done article-wise back to about 2011. I believe Photobucket is counting on this, and figures I'll cave and pay money.

Nope. I'm moving everything. I'll pay another company to host my stuff. Idiots running Photobucket.

Regards,

Josh


Wed Jun 28, 2017 6:29 pm
Profile
Site Admin
User avatar
Site Admin

Location: Renton, WA
Joined: Sun Mar 13, 2011
Posts: 30390
Real Name: Steve
Yup . . . Photobucket has been a piece of garbage for about the past five years. It more resembles a spammy fringe news site than a photo-hosting site nowadays.

_________________
Steve

Benefactor Life Member, National Rifle Association
Life Member, Second Amendment Foundation
Life Member, Gun Owners of America
Life Member, Citizens Committee for the Right to Keep and Bear Arms
Please support the organizations that support all of us.

Leave it cleaner than you found it.


Wed Jun 28, 2017 7:26 pm
Profile
Online
Site Supporter
User avatar
Site Supporter

Location: Lynnwood
Joined: Thu Dec 6, 2012
Posts: 5293
Real Name: Sergey
Josh Smith wrote:
Hello,

Photobucket unexpectedly decided that hotlinking may only be done for paid accounts now.

I have no problem with this. I generally pay for Photobucket, but had not renewed yet this year. However, Photobucket caused a lot of problems by not warning its users in an effective manner. I personally saw no warning.

I'm moving hosting to smith-sights.com until I decide on another dedicated picture host. I've not disappeared. Please bear with me. I'm not the only one effected by this.

However, this illustrates why centralized storage is a problem. This Photobucket trick is reminiscent of ransomware ("Pay us money and you can again access your files".) It's not exactly the same because I can still access my files. I just cannot give remote access to these files without paying.

This effects everything I've done article-wise back to about 2011. I believe Photobucket is counting on this, and figures I'll cave and pay money.

Nope. I'm moving everything. I'll pay another company to host my stuff. Idiots running Photobucket.

Regards,

Josh


imgur is where it's at.

_________________
Sign up for Uber using this link and receive a bonus: https://partners.uber.com/i/1p9ey


Thu Jun 29, 2017 7:49 am
Profile
Site Supporter
User avatar
Site Supporter

Location: I-5 /512
Joined: Thu Dec 8, 2011
Posts: 10618
Real Name: chris
RusoArmo wrote:

imgur is where it's at.





[img]BOOOM![/img]



i've got a few and never had a problem

_________________
Image


Thu Jun 29, 2017 7:58 am
Profile
User avatar

Location: South King County
Joined: Mon Mar 31, 2014
Posts: 16
Awesome review. I just bought the CMC full power 10 spring and follower to convert two cheap 10rd magazines to run reliably. Ran one o rapid fire and so far so good. And I plan on getting a few of those 10rd RPM mags soon. Thanks again for the review.


Tue Jul 25, 2017 12:11 pm
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 9 posts ] 

Who is online

Users browsing this forum: No registered users and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum



Rent Me Pintos NRA SAF CCKRBA
Aldersons UPAMMO


Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF.
[ Time : 1.187s | 15 Queries | GZIP : On ]