I believe it is a government model and yes it is full size. I talked to the person who got it for me and they are going to get me what I need to return it. Then I did a little more research and found one that is only 28 rounds but has good reviews for the rock island 1911, so im going to get that one and hope that it works! its theSK
Is your Rock Island 1911 a government model and full size 1911?
Assuming your pistol works fine with regular mags. And those 40 round Mags are supposedly designed for Ball Ammo, so the ammo is not an issue. I hate to be the bearer of bad news but IMO the word PRO MAG is a key point. They are not known for the highest quality. And you also you advised, it did not want to lock in your pistol that was another sign of quality issues. Did they happen to get a receipt or know where they got it?
I had just purchased 4 of the following just for shooting on the Range and thought I would save some money over factory Glock Mags! That was my mistake! Never again will I purchase any Pro Mags! I had heard of issues in the past from others.
In fact two weeks ago, I sent 4 Model 17 Glock Pro Mags I purchased from the Magazine Wearhouse back to Pro Mag direct. Because I could only get 10 rounds of the 17 in them! They sent me replacements that were not any better. So kept them and will only be loading 10 rounds in them just for shooting on the Range. I had never experienced that with any magazines before. And I have been involved with hundreds of weapons and Mags in my career. I also worked for several years with a major custom 1911 and AR Manufacturer. So this was a Suprise!
Learn something new everyday. I NEED a 1911, real one, and a Garand M-1.sk1ttlezninj : just for information and in case ya didn't know, a 1911 with a 5" barrel is considered a "Government", while one with a 4.25" barrel is a "Commander" and one with a 3.5" barrel is an "Officer"
As noted, ProMag is not held in high regard by most 1911 guys.I loaded the drum and put it in but the slide won't cycle.