Rifle receiver alignment and tensioning system

A receiver lock tension and alignment system configured for a rifle comprising:

• (a) an upper receiver having a lug positioned within a rear portion of the upper receiver;
• (b) a lower receiver defining a hole for receiving a plunger pin configured to engage the lug of the upper receiver;
• (c) a cavity defined by an interior portion of the lower receiver and configured to receive the upper receiver;
• (d) an alignment groove formed on the lug and configured to engage with the plunger pin;
• and
• (e) an interior spring provided within the plunger pin;
• wherein, the interior spring is configured to press the plunger pin against the lug to create tension between the upper and lower receiver in an assembled configuration.

A method of reducing movement between an upper receiver and lower receiver of a firearm comprising:

• (a) providing an upper receiver having an alignment groove arranged on a lug;
• (b) providing a lower receiver having a cavity configured to receive the upper receiver;
• (c) providing a plunger pin arranged on an interior portion of the lower receiver;
• (d) inserting the upper receiver into the cavity of the lower receiver;
• (e) aligning the rear lug with the plunger pin to center the upper receiver in the lower receiver;
• (f) exerting a sufficient force on the upper receiver to engage the plunger pin into the alignment groove;
• and
• (g) securing the upper receiver to the lower receiver.