We hold that a defendant who fails to object in the district court to multiplicitous convictions and sentences does not waive his or her right to raise a double jeopardy challenge on appeal. Because we conclude that the district court plainly erred by sentencing the appellant Joseph Manuel Zalapa on multiplicitous firearm counts and entering judgment, we reverse.
I. Factual and Procedural Background
On October 20, 2005, officers in the Santa Ana, California Police Department (“SAPD”) were in a parking lot investigating the presence of a stolen vehicle. While in the parking lot, the officers observed Zalapa and another man “acting suspiciously.” At that time, Zalapa was carrying a backpack. The officers attempted to approach Zalapa and his companion. When approached by the SAPD officers, Zalapa fled in one direction and his companion fled in another. In the course of attempting to elude the officers, Zalapa dumped the backpack over a fence in the yard of a home that he passed along his intended escape route. The officers apprehended Zalapa shortly thereafter. They recovered Zalapa’s backpack after a resident of the home discovered it and turned it in to the police. Zalapa’s backpack contained 64 rounds of 9mm ammunition, a magazine loaded with 29 rounds of 9mm ammunition, and a Sten M-5 rifle.
At the time Zalapa was arrested, he was on probation for a prior felony drug offense involving a firearm. As a term and condition of his probation, he was prohibited from possessing a firearm or ammunition.
*1062 A federal grand jury indicted Zalapa on three felony counts: possession of ammunition by a convicted felon (Count One); possession of an unregistered machine gun (Count Two); and possession of an unregistered firearm with a barrel less than 16 inches long (Count Three). Counts Two and Three charged Zalapa with violating 26 U.S.C. § 5861(d), which provides that “[i]t shall be unlawful for any person ... to receive or possess a firearm which is not registered to him in the National Firearms Registration and Transfer Record.” There is no dispute that both firearm counts arose out of possession of a single unregistered firearm- — -a Sten, model M-5, 9mm machine gun, serial number 237508.
Zalapa pleaded guilty, without a plea agreement. Zalapa did not object to Counts Two and Three before he entered a guilty plea. The district court sentenced Zalapa to a $100 mandatory special assessment, a 42-month sentence, and three years of supervised release for each of the three counts. The sentences were to be served concurrently, and the supervised release terms were to run concurrently. Zalapa also did not object to the convictions or sentences when they were entered by the district court.
Zalapa now appeals his sentences and convictions for Counts Two and Three. We have jurisdiction under 28 U.S.C. § 1291. Zalapa contends that, because the convictions and sentences under 26 U.S.C. § 5861(d) are multiplicitous, they violate the Double Jeopardy Clause. We agree.
Zalapa alternatively argues that, even if he waived the multiplicity objection by failing to object to his convictions and sentences below, he is still entitled to relief due to ineffective assistance of counsel. For the reasons discussed below, we decline to reach this alternate ground and instead reverse based on the district court’s plain error in sentencing Zalapa on the multiplicitous counts and entering judgment.
II. Analysis
A. Multiplicitous Convictions and Sentences
We conclude that Zalapa’s convictions and sentences on the firearm counts are multiplicitous. Where a defendant is convicted of multiple violations of the same statute based upon a single act or transaction, “the Supreme Court has stated that the proper inquiry involves the determination of ‘[wjhat Congress has made the allowable unit of prosecution.’”
United States v. Keen,
*1063 Accordingly, convicting and sentencing Zalapa for both firearm counts resulted in multiplicitous sentences and convictions and violated the Double Jeopardy Clause.
B. Waiver
We now address whether Zalapa waived his right to challenge the multiplici-tous convictions and sentences by failing to object below. We conclude that he did not. In reaching that conclusion, we recognize the distinction between objections to multiplicity in the indictment, which can be waived, and objections to multiplicitous sentences and convictions, which cannot be waived.
See United States v. Smith,
This conclusion is consistent with our holding in
Launius v. United States,
We recently reaffirmed this principle in
United States v. Ankeny,
The court then observed that “the plain error standard applies when the defendant failed to raise the issue of multiplicitous sentences in the district court, which was not the case here.” Id. The court noted that “even if the plain error standard did apply, Defendant’s conviction of multiple counts of being a felon in possession of a firearm, rather than a single count, harmed his substantial rights.... ” Id. at 839 (internal citations omitted).
Our case law distinguishing between objections to multiplicity in the indictment itself and objections to multiplicitous convictions and sentences follows explicit Supreme Court precedent.
See Ball v. United States,
*1064
The government argues that
United States v. Klinger,
Here, like the defendants in the 2005
Smith
decision,
Launius,
and
Ankeny,
Za-lapa challenges only his multiplicitous convictions and sentences, not the form of the indictment. Zalapa voluntarily pleaded guilty to all three counts and did not object to the form of the indictment in the district court. By failing to object to the multiplic-itous indictment before pleading guilty, Zalapa waived any objection to the form of the indictment.
Klinger,
C. Plain Error
We hold that it was plain error for the district court not to vacate one of the firearm counts before entering judgment and sentencing Zalapa.
Where a defendant fails to raise the issue of multiplicity of convictions and sentences before the district court, we review the district court’s decision for plain error.
See Smith,
“[A]n error is not plain unless it is ‘clear’ or ‘obvious.’ ”
Smith,
The multiplicitous convictions and sentences affect Zalapa’s substantial rights because they have collateral consequences, including the possibility of an increased sentence under a recidivist statute for a future offense.
See Ball,
Finally, the district court’s error was serious enough to “‘affect[] the fairness, integrity or public reputation of judicial proceedings.’ ”
See Olano,
III. Conclusion
In summary, we conclude that Counts Two and Three are multiplicitous. The remedy for meritorious multiplicity claims is for the district court to vacate the multi-plicitous conviction and sentence.
See Rutledge,
REVERSED AND REMANDED.
Notes
. The convictions at issue here, both arising under the same statute, are different from convictions for conduct punishable under two or more separate statutes.
Compare Keen,
. The government argues that any adverse collateral consequences result from Zalapa's convictions, and not his sentences, and that he waived any challenge to the convictions by failing to object to the indictment.
Rutledge
drew no such distinction in vacating one of the defendant’s sentences and convictions despite his not objecting at trial, and we decline to do so.
See
