There are two problems with most any brand 4" 1911s, they have a short recoil spring life, about 800 rounds is my manufacturer's replacement recommendation, and you can't disassemble the barrel from the slide without that little wire tool or a paper clip bent to serve as the tool.
Well, Wilson Combat has a flat spring recoil kit that solves both of these problems. Wilson is claiming 10x the life of a standard round coil spring. 10 times! Imagine what used to be 800 rounds is now 8,000 rounds.
And two, they've made the guide rod slightly shorter so the gun can be field stripped without a tool of any kind!!!
It's a little pricey because you have to buy the guide rod, plug, and flat spring. Since the flat spring has a smaller ID, it won't fit standard guide rods. The whole kit costs $49. But, that's mostly a one time cost, meaning that from that point forward you would only have to replace the spring - if you shoot 8,000 rounds! However, if you shot 8,000 rounds with a round recoil spring and changed it out at 800 rounds, that would be 10 recoil springs. At say $5 a piece, that's the cost of this kit!
Here's the info on it - be sure to watch the video. I just ordered two, one for a Kimber Tactical Pro and the other for a Kimber Super Carry Pro. I also ordered three of the full size kits for my full size 1911s, Kimber TLE/RL, Desert Warrior, and Super Carry Custom HD.
I went to the range and installed the WC kit, it's that easy, in my Tactical Pro and shot 100 rounds. They were all flawless. I had been used to a full-size all steel gun, the DW or TLE/RL so I was expecting a bit more recoil from the aluminum framed 4" Tactical Pro. I can't say that I noticed any difference. Then I did my standard rapid fire drills and recall thinking, "that was pretty fast". Those two things together make me think the recoil spring may have softened the recoil a bit.
The kit is pretty straight forward to install, pretty much just like the video illustrates in the link above.
It's worth noting that the full-size kit, i.e. 5", does not come with a plug like the 4" kit does. Hence it's less expensive, only $19.95 for the spring and guide rod, but if you have a full-length guide rod, you will need a 'closed' plug to replace the open one used with a full length guide rod.