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NFA Processing Update: As the result of the government shutdown, Shield Group AMT is currently experiencing delays in NFA transfer approvals. We will continue to submit transfer applications for newly submitted orders via eForms, but due to the uncertainty related to the end of the shutdown, we are unable to provide estimated dates for approvals. We apologize for the inconvenience and thank you for your understanding.

THE PRIMARY WEAPONS SYSTEMS DIFFERENCE

Significant differences are present in the MK1 and MK2 PWS compared to both the direct-impingement operating system and other piston-driven operating systems. PWS product improvements address reliability and performance issues as well as reduced carrier tilt, cam-pin wear, and carrier bounce.

Proponents of piston-driven ARs point to greater reliability in adverse conditions and less reliance on routine maintenance compared to the direct-impingement operating method.

The increasing use of suppressors for private citizens, law enforcement and military highlights another advantage of piston-driven ARs—the ability to adjust the amount of gas siphoned to operate the action.

Suppressor use increases operating pressures a considerable amount, so being able to turn down the gas vented to the operating rod just by quickly turning a knob is a big advantage.

Piston-driven ARs also enjoy a perception of better operating reliability in harsh environments, especially as barrel lengths shrink. The PWS MK1 series represents cutting-edge long-stroke AR design. This is different than the original Stoner-designed gas impingement design as well as the growing numbers of short-stroke piston ARs on the market.

                                                                                                            

                                                                          


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