Spuhr’s New AR Upper with Patent-Pending Fitment Solution

After five years of development and multiple live-fire prototypes, Spuhr has created a new patent-pending system that eliminates the play between AR-style upper and lower receivers. This long-standing issue has frustrated shooters looking for tighter lockup and improved consistency, especially in precision or professional use.

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Unlike traditional methods that rely on shims or tension screws, Spuhr's system maintains a secure fit throughout the upper's lifespan. If play ever develops over time, the system is fully adjustable, offering a long-term solution that works with both newly manufactured rifles and existing lowers.

During testing, Spuhr paired standard mil-spec lowers with their own proprietary upper, and the results were a noticeable improvement in overall rigidity and performance. In addition to solving the upper-to-lower fit issue, Spuhr also reinforced the barrel attachment point, addressing what they describe as the primary structural weakness in the AR platform.

In a traditional AR-style rifle, even a small amount of play between the upper and lower can introduce point-of-impact shifts (POI), particularly when the rifle is supported on a barricade, bipod, or sling. The reason is simple: pressure applied to the handguard or grip can cause micro-movements between the upper and lower, and even slight deflections in the barrel or optic path. This shift in geometry, though small, becomes more noticeable at a distance. This “feature”  can also be unpredictable from shot to shot, and it’s something I’ve tried and experienced myself.