Simple look at Pros and Cons of 6061 vs 7075:

There has always been a debate about 6061 vs 7075. However, at LSD, we offer lowers, uppers, and matched sets in both 6061 and 7075 materials. 

In any case, here are our thoughts on the matter.

Pros for 6061 – Very strong. Reparable via aluminum welding in case of damage. Important when SBR’ing or if no further lowers are available in the future – It’s nice to be able to repair a receiver. Cons – Subjectively weaker than 7075 (see our Youtube Video of 6061 testing for a comparison and abuse testing).

Pros for 7075 – Stronger material (on paper) and more resistant to true “corrosion” than 6061 (this is virtually irrelevant with today’s Type 3 hard anodizing and other finishing options).  Cons – 7075 is not repairable via aluminum welding without access to very expensive equipment.

Many of you may not know, but the AR Stoner 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 60s AR platforms were produced using 6061, 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 was the quick answer, and hence became “mil-spec”. 

Payment Policy:

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.

Refunds & Returns:

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.

Ordering & Shipping:

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.

The United States is the “land of the free.” We are given far more liberties than many other countries in the world today — freedom of speech, press, and the right to bear arms. It’s that last one that causes quite a stir amongst people. The 2nd Amendment — the right to bear arms  — is a controversial topic, and that many states are splitting hairs over. Numerous states have enacted laws and regulations barring their sale, manufacture, and your ability to build an 80% rifle.


Before we get started, let us quickly touch base on what an 80% lower is or is not.

An 80% lower is a blank receiver, which, according to the ATF, is not yet a firearm. It is missing the final 20% that would make it a weapon.

As a firearm builder, you have to cut and drill critical portions of the receiver blank to finish your project. Once you are done milling, the receiver blank becomes a stripper lower receiver — a firearm.


It is legal to purchase and own a receiver blank in most states, with a few exceptions.


Attorney General Gurbir Grewal sought to cease sales of “ghost guns” in New Jersey. As we previously mentioned, an 80% lower is not yet a gun.

Still, Grewal banned their sale and ownership and threatened retailers with fines and legal consequences if they refused to comply. New Jersey A4791, bans the ownership and purchase of anything used to make a firearms without a serial number. We will not ship to NJ. 


Washington passed House Bill 1739, banning the sale of what they call “undetectable firearms.” If you live in the state, the bill prevents you from buying, owning, or building a polymer 80% firearm, though aluminum is still on the table.


In September 2019, the Attorney General of New York sent out Cease and Desist letters to manufacturers and retailers making and selling 80% lowers. He claimed they were illegal and threatened court battles with each.

As of this time, the New York State Senate passed S.7763-A/A9903, the Jose Webster Untraceable Firearms Act which bans the sale and ownership of an 80% lower receiver. 


California allows the purchase and use of 80% lowers, so long as you apply for a serial number via the California Department of Justice. Your unique number is registered and engraved on the receiver or frame of your AR-15.


In June 2020, Hawaii banned the sale of 80% lower receivers by enacting HB 2744. This bill prohibits the manufacture or purchase of parts for the purpose of assembling 80% lowers with no serial numbers.


Since Connecticut enacted H.B. 7219 all 80% lower receivers must have a serial number obtained from the Department of Emergency Services and Public Protection engraved on them before they are manufactured.

As laws and regulations constantly evolve, we recommend checking your local and state laws before attempting to buy an 80% lower. If you purchase an 80% and live in a state that clearly has restrictions in place, your order will simply be cancelled. 

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.