Quote:
Originally Posted by apilar
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In the 1911 platform, you have to realize that there are actually 16 points of major contact along the slide/frame rail.
Three exist on the top left of the frame: two on the internal frame. One on the external frame.
Three more exist as a mirror, on the right side of the frame.
Six more exist on the underside of the rail, as a mirror of the top of the frames' rails.
Two more contacts exist inside the dust cover, where the slide contacts it at the sides, just underneath the scalloped cut. Looking at a lot of slides, you'll see two nubs machined in to it - this is the contact point.
The final two contacts exist at the back of the slide, again, contacting the side of the frame on the valley of the rail of the frame. By extension, the frame mates to the valley of the rail in the slide, for an extra 2 points of contact, but for the sake of this discussion, we'll refer to these 4 points of contact as only two, since they are so close together.
All 16 of these contact points make up the overall fitment of the slide to the frame. Understanding all 16 points are also the key to slide to frame fitment. While fitment may be tight at first, over time, wear will take down all of these contact points, and both the slide and the frame will loosen up. Exacerbating this issue, is the fact that the Marui 1911 platform uses a dual receiver setup, which is not ideal. It causes alignment issues in some cases... and in other cases, can add additional contact points that are further unnecessary (problems usually arise when this happens.)
To narrow it down, there are two main forms of slide to receiver wobble:
- Axial - along the axis of the bore. Either the slide can lift up & down on the left side, and/or on the right side.
- Lateral - the slide is able to slide left-right on the frame.
The former type of wobble is easy to fix... moreso on real guns rather than on airsoft, but it's not impossible with airsoft, and I've tightened up many guns using real steel techniques. Care just needs to be made so that unrepairable damage is avoided.
Lateral wobble is much harder to fix and requires a lot more manipulation of the rail arms.
To put this in perspective with what your situation, Each setup needs to be looked at carefully to see what the differences are. You can usually tell this by looking at the spacing between each of the contact points between two different setups, as well as where wear points exist. For example, there should be minimal wear on the bottom of the slide... and this is where most differences occur. Some internal receivers fit tighter to the external receivers, and further inset. The tighter it is, the tighter the slide will be pulled towards the top of the frame. In very tight setups, a slide can get completely locked up against the frame. Slides are generally the guilty culprit in this - especially with die-cast slides, where the height between the bottom of the slide to the valley of the channel can differ by as much as 0.5mm. This area, if too thick, can bind up hard against the top of the frame.
As a gun is used, an internal receiver can settle in. Wear can cause the slide to loosen upwards, or the internal sleeve can settle further in to the external frame.
This is the best "explanation" that I can give to your scenario, and unless I have your guns in my hands, I can't give you the exact reasons for what you're experiencing. But what I've explained will be exactly what I'd look for to give you a detailed explanation for your application.
With all that said, because of the malleability and overall lower durability of cast metals, the best setups are with machined billet parts. ILLusion Kinetics recognized this a while ago, and the first CNC machined aircraft billet aluminum internal receiver was just released in July. It features monolithic rails (which also negates the need for a slide spacer - Tanio Koba, Airsoft Surgeon, Hurricane, or otherwise) and precision fitment of the hammer plate to the frame and all pivot points (hammer & sear). We don't have a 1911 receiver in production yet - it's been in research & development for a number of years now. There are difficulties caused by the two-frame system, and is made more difficult with the requirement to get a precision fit between parts. Anyways. That's production issues.
For now, the ILLusion Kinetics frame is available now and it fits Nova frames/slides reeeeeeeeally well. I have one installed in my Nova Kimber Warrior kit, and it has absolutely zero play axially, or laterally. It's the most solid setup I have, and now brings 1911's up to the level of ILLusion Kinetics built Hi-Capas.