Accuracy International Chassis Information Thread

kft101

Objective
Full Member
Minuteman
Nov 1, 2009
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1,191
NY
After seeing questions asked and answered about the various Accuracy International Chassis System (AICS) offerings sporadically posted, and having asked and then fielded those same questions myself, figure it would be a good idea to start a singular centralized thread to document the history and details of the AICS.

Over the course of this thread, I plan to cover the original AICS, the later revised “small bolt handle notch” AICS, the AT AICS, and both the pre and post 2014 AX AICS.

I am by no means an expert on Accuracy International, and have no inside track on their history or products. Everything I know has been gathered by asking questions and obtaining from other posted sources of information. If I post something incorrect or someone else knows other information, please add input.

Let’s start with the original AICS, commonly referred to as the Legacy AICS. This chassis was based on the classic Arctic Warfare (AW) chassis frame with thumbhole skins/stock sides. The Legacy AICS came in three standard configurations:

1.0 - Fixed stock, fixed cheek
1.5 - Fixed stock, adjustable cheek
2.0 - Folding stock, adjustable cheek

Of course, there are the oddball configurations, such as 2.0 rear skins with fixed cheek.

Before going into the standard configuration Legacy AICS models, let’s start with a less common original first version of the 1.0:
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This is the original AICS as when it was first released, and only made as such for a year or two before changes were made to the eventual Legacy AICS as most are familiar with. These original first versions of the Legacy AICS are identified by two main differences, a completely welded chassis frame and a fully swept back bolt handle notch:
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And as everyone is already aware of Accuracy International’s color inconsistency, the older green skins were a shinier and more olive drab green compared to the later green Legacy AICS skins:
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Similar breakdowns of the other AI chassis systems to follow if there’s interest.
 
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I'm interested too. I have a legacy AICS that is just before the AT AICS was introduced. It doesn't have the block of aluminum around the bolt handle.

(click on picture for larger image)
View attachment 8791197
Yes, you have what’s commonly referred to as the “small (bolt handle) notch” AICS, which were made at the tail end of the original Legacy AICS line and when AI introduced their multi-part skins, parts of which would continue being used on their future chassis lines (same grip panels used on the AX and AT AICS lines, rear skins on the AT AICS lines). I’ll cover this in more detail in a future post.
 
Let’s cover the three (most common) standard configurations of the Legacy AICS, which were offered in both short and long action versions:

1.0 - Fixed stock, fixed cheek
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1.5 - Fixed stock, adjustable cheek
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2.0 - Folding stock, adjustable cheek
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The more common later production Legacy AICS featured the same large square frame around a now hybrid bolt handle notch cutout (straight in the front for straight vertical handle bolts, but still swept in the back for standard R700 angled bolt handles - the “mullet” cutout) and now pinned and bonded frame segments instead of the original early production fully welded frame (although the vertical butt pad section remained welded to the horizontal section of the butt stock).
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Common to all Legacy AICS versions is a single long rail slot and sling or bipod loop at the bottom, as well as an HK sling hook plate and bipod spigot block (flush initially, and then extended offered later on) at the tip of the forend.
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On the other end of the chassis, the basic adjustments for length are made with a simple combination of a butt pad and different sized spacers, and adjustment for height via a plastic cheek piece with two steel rods secured by bolts (or thumbscrews for those that want to get fancy) tightened against the rods. Quick adjustable options were offered for both length and height, but that’s a topic for another day.
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Folding stocks features a very robust hinge attached in the rear frame, secured by countersunk screws and bonding, with a separate male and female pieces folding catch mechanism.
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That covers the basic of the Legacy AICS. Various factory and aftermarket options and accessories were offered, some of which can be covered later.
 
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