SPAS/LAW/SAS 12 Replacement Receiver Shock Absorber

Technical Details


New Style


Old Style

The factory parts were likely molded of Cast Nylon 6.  This is about the best material if you are going to mass produce by molding parts.  It has an impact strength of around 0.4 ft.-lbs./in. and hardness of around Rockwell R115.

Since we  are machining each part, we can use a much better material.  The new parts are made of Ultra High Molecular Weight (UHMW) Polyethylene.  This material has about the highest impact strength of any plastic at any price -- and what we want is Impact Strength.


Impact Strength -- The ability of a material to withstand shock loading. Determined by the notched Izod test, which measures the effect on a
material when it is suddenly impacted by a swinging pendulum. A larger number signifies greater impact resistance.

Note almost four times the impact strength of "unbreakable" Polycarbonate.  One Hundred times the impact strength of Cast Nylon.  I will offer a lifetime warranty against the part splitting or shattering.

I am using a special type called Oil-Filled UHMW Polyethylene.   This has oil impregnated within the Polyethylene.  This actually doubles its tensile strength and lets it survive down to -450° F.  The oil helps to make anything contacting slides and does not stick and dig in.
 

Oil-Filled UHMW Polyethylene

• Color: Opaque gray
• Temp. Range: -450° to +180° F
• Impact Strength: Excellent
• Low friction
• Hardness: Shore D62-D67

Note that the Polyethylene is softer than the Nylon (at Rockwell 115) and should do, if anything,  a better job of absorbing the shock.

This does not use the metal load spreading steel disk on the factory part.  The "old style" had no disk, but often broke up.  They added the disk to the new part to try and get their Nylon to survive.  The superior material I am using will not break up under any circumstances and needs no disk.   Also, the new part is held in by a stainless steel screw from the other side rather that the "tit" that always broke off.  The "tit" helped with quick mass assembly -- the screw will last much longer.

The prototype is back from testing (90 high-powered loads, thanks Oscar!) and it worked perfectly.  Notice the slight mushrooming of the unsupported portion.  This shows plenty of shock absorbing was going on.
 
 

Installation

I suggest you have the part installed by a competent gunsmith.  I won't supply full instructions here, if you don't know how to install it -- don't!

The part is held in place with a #6 Stainless Steel sheet metal screw (supplied).
 
 
 

It will be necessary to remove a small amount of material from the stock to clear the new screw head.
Some users have used a smaller screw.  You are welcome to try this, it's your gun.  I just wanted to supply a screw that assured the part would never, ever break free.
 
 


Old-Style vs. New Style

Be sure you determine which part you need -- the new-style or the old-style. Look here for details.  (Note -- the old-style part can still be bought in plain Nylon from Carlson's.)

Purchase

This part is very expensive to make in small quantities.  The material is nasty to accurately machine and requires quite a few machine setups, the cost of each must be spread across all the parts.   If you'd like 1,000 at a great price, drop me a line. :)
 
New-Style
The cost is $49.95 plus S&H 
Old-Style
The cost is $44.95 plus S&H

Shipping and handling is a flat rate of  $8.00  per order to anywhere in the USA, sent via USPS First Class Mail (2-5 Days).


Fine Print: All purchases are final, and are F.O.B. Kettering, Ohio.  We may exchange an incorrectly ordered part at our option, but no refunds are given -- we can't sell used parts.  THIS PART IS SOLD "AS IS" BY APPLIED TECH, INC. AND WITHOUT WARRANTIES AS TO PERFORMANCE OR MERCHANTABILITY OR ANY OTHER WARRANTIES WHETHER EXPRESSED OR IMPLIED.   NO WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE IS OFFERED.   THE PURCHASER MUST ASSUME THE ENTIRE RISK OF USING THE PART.  ANY LIABILITY OF THE MAKER, OR SELLER, WILL BE LIMITED EXCLUSIVELY TO REFUND OF PURCHASE PRICE.  Professional installation is recommended.
We try to deliver most orders from stock, but delivery may take up to 45 days.

International Shipments 

If you are ordering from outside the USA, the shipping, handling, and Customs paperwork is a flat rate of  $31.00  per order for USPS Global Priority Mail (4-7 days) wherever it can be sent.
Our Post Office has just raised the rate for International Priority Mail to $21 for most destinations.  I also have to do customs paperwork, and I must stand in line at the Post Office for 20 minutes and personally mail international shipments.


You may also purchase by sending certified funds to:
C.
PO BOX 292039
Kettering, OH  45429-0039

 
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