6061 vs 7075 Aluminum. What's the Difference?

The original AR rifle was originally spec’d to be a steel receiver and to fire a 7.62 round. The military needed it lighter, and to have a higher capacity, so the 5.56 round was spec’d and they asked if it could be made from aluminum. The early 1960’s AR platforms were produced using 6061 aluminum, but after the platform was deployed for use in Vietnam, it was quickly noticed that the 6061 was showing signs of early wear and corrosion from the constant humidity and SALT from handling by sweaty soldiers. 7075 aluminum was the quick answer, and thereafter became military specific.
6061 aluminum is very strong and can be repaired using aluminum welding in case of damage, but it isn’t as strong as 7075 material.
7075 is an all around stronger material and is more resistant to corrosion than 6061. 7075 can only be repaired using very specialized equipment, but repairs are far less common than 6061.
At LSD arms, we offer lowers, uppers, and matched sets in both 6061 and 7075 materials to give our customers as many custom options as possible when building their firearm.

Order Cancellation Fee:  Any order canceled after being placed with a credit card will be charged a 6% cancellation fee to cover merchant services charges we incur when your order is placed as well as when your card is refunded.

Restocking Fee:  Any order canceled after a tracking number has been assigned and order status has been updated to shipped in our system will be charged a 10% restocking fee. Any order returned that is neither defective nor damaged will be charged for any shipping charges we incurred in getting you the order, the 6% cancellation fee to cover fees from merchant services and a 10% restocking fee.

Due to supply chain restraints, increased order volume, increased carrier volume, and all major carriers removing guaranteed transit times, please expect delays in receiving your item.  Please do not call or email asking for expedited processing.  Please ensure any firearm orders are complete with information for the FFL you’d like to use for your transfer to prevent any delays.  We appreciate the thousands of  patient customers that choose to purchase from us, and we strive to get your orders out as quickly and accurately as possible. Thank you for your understanding.

Additional Items and Substitutions: Unfortunately, we will not be able to add or alter the contents of your order after you submit the order. Please make sure to review the quantity/items before you submit payment. If you need additional items, you will need to submit a new order. 

Address changes & FFL updates:  If you need to update your shipping address or FFL information on an order, please email (customerservice@lsdarms.com) as soon as possible with the correct information, referencing your order #. We try to process our orders as soon as possible. Please review your order before and after submission to verify your shipping address and info is correctly displayed.

Package Protection for Damaged/Missing Items:  Once the order has been picked up by your selected carrier, we can not control what happens to the package. Packages go missing and/or get damaged infrequently, but anyone that has dealt with these carriers knows that packages endure abuse from time to time. For these reasons, we have partnered with Route Package Protection, to provide a worry free, hassle free claims process for missing or damaged shipments.  If you opt in for Route Package Protection upon checkout, you’ll receive detailed information on what to do if a package is damaged or never arrives. In the rare case of shipping errors on our end, email customersupport@lsdarms.com and we will correct the mistake as soon as we can.

Estimated lead time for variance orders:

Due to the increase in orders we’re receiving and the slow down in raw material deliveries, our variance order lead times are as follows (These are estimated lead times. Circumstances outside of our control may affect these times after your order is placed. We will not add to your existing order to “compensate” for increased lead times) :

  • Billet Lowers (most models)  16-18 weeks
  • Billet Uppers (all models)  18-20 weeks

***To be fair to all of our dealers, orders exceeding 100 parts of any SKU will be broken into smaller invoices/shipments based on available raw stock and other orders placed during the same time period.   

***Due to the rising costs of RAW materials, all orders are subject to price changes between the date of your order, and the time in which you are invoiced. 

We accept Cash, Bank Checks, and Credit Cards (Visa, MasterCard, Discover and American Express). Washington state sales tax of 8.9% will be added to your total when buying in store or ordering online with a Washington shipping address.