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Posted: 8/18/2010 1:01:56 AM EDT
Cutaway view helps to identify what makes the P415 a robust platform and understand how it operates. This is what makes the P415 a "System" and not a "Parts Kit". 
Simple regulated short stroke gas piston design having only 3 parts all coming out the front of the gas block. Oversize Heat Sink barrel Nut that does three functions. Reduces/Radiates Heat, Guides the Op-Rod (almost 4" of guidance), and helps to Reduce Flex / Stress, with our free floating, two piece M.R.R. (Modular railed Receiver) Platform. The free floating, two piece M.R.R. (Modular Railed Receiver) with backbone, is 5X's thicker then a Mil-Spec flattop upper. M.R.R (Modular Railed Receiver), is .300" thick between charging handle and top of M.R.R.. The mil-spec flat to upper is .06" thick between the charging handle and the bottom of the picatinny slots. The free floating, two piece M.R.R., having a continuous one piece top rail, sleeving onto the oversize heat sink barrel nut, and indexing and attaching to the lower portion of the two piece upper receiver provides a extremely robust platform, that helps to eliminate flex and stress in the barrel extension/bolt area of the upper receiver. The cutaway view helps to identify how and why. The M.R.R. takes less then 3 minutes to assemble. 
Offering Professional Grade Weapon Systems since 2004. Best regards, Frank L. DeSomma Patriot Ordnance Factory, Inc. www.POF-USA.com [email protected] 623-561-9572 WK. 623-321-1680 Fax 
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Out of curiosity –– How different is this cut away from the system that Bushmaster uses that is based on your system? I only ask because I own the Bushmaster version. The piston assembly looks very similar, as does the design of the bolt carrier... But I did notice that they don't have the coating on the carrier like you do. Is the barrel nut different? |
Quote by AR15 member 87GN : Not the best photo, but this shows the relative thickness of the POF and standard M4 uppers, as described above. This is a close up picture of a cutaway view of Mil-Spec Flattop upper receiver that has a .06" wall thickness between the picatinny slot and the charging handle and our M.R.R. (Modular Railed Receiver) that is .300" wall thickness between the top of the receivers backbone and the charging handle. Our engineered design is 5X's more material / thicker, then the mil-spec flat top upper. This is only one of many features our weapon system offers to eliminate heat, flex, and stress in our platform. The picture clearly identifies which upper receiver design is stronger.
PS: Just think of the stress a vertical grip mounted on a rail system puts on the upper receiver were the bolt and lock up is when the operator pulls back on the vertical grip during use on the thin walled mil-spec flat top receiver. Their isn't much material to support the barrel extension, barrel, and bolt during lock up, when all the stress from pulling on the vertical grip is pivoted where the rail systems clamp on the mil-spec barrel nut. Best regards, Frank L. DeSomma Patriot Ordnance Factory, Inc. www.POF-USA.com [email protected] 623-561-9572 WK. 623-321-1680 Fax
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Quoted:
The cutaway that you guys had at SHOT a couple of years ago is one reason I bought a POF upper. Thank you. We hope it helps explain why we re-engineered.
Best regards, Frank www.POF-USA.com
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Here's a cut away view of our compact 9.25" P416 upper. Our 2 piece Modular Railed Receiver (MRR), is a very rigid design, that helps to prevent flex. The backbone on the upper receiver is .300" thick. This is 5X's thicker then the mil-spec M4 flat top upper receiver's which are only .06" thick between the charging handle and picatinny slots.
Best regards, Frank
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